Dragonball Z is the 2nd series of the Big 3.
Dbz consists of 6 major sagas; Saiyan Saga, Frieza Saga, Trunks Saga, Android Saga, Cell Saga, and Buu Saga.

Although Android#21 was still placed in a regeneration tube, he was assigned a command--to feast on the energy of over-rebellious androids that didn't obey.Android #17 and Android#18 break out of the lab, and they bring along the strong Android#16, (who turns out to be a peaceful robot, later on). Our Z Warriors are aware of these new nemesises, and begin to confront them-but they are no match for them and continue to fight and fight reaching no particular victory. The problem is, endurance is what is lacking for our heroes, because of the Android's long endurance and long-lasting energy, and they can fight with much more stamina than the unprepared combatants. Suprisingly, Goku suffers a Heart Attack, and retreats-shocked. Trunks from the future was luckily sent back by his mother, Bulma, to give the heart-medicine to heal Goku's heart. Goku is saved, but the Z warriors avoid confronting the overwhelming power of the Androids-therefore they go up to the Heavens and Train in a special gravity room to prepare. Piccolo tries to ready himself for the fight as well, by fusing with Kami-his half-father and guardian of the DragonBalls-while Dende, the young Namek assumes the position of DragonBall guardian. Androids #16, #17, and #18 go out to find Goku to kill him. Piccolo spots the Androids and they begin to duel. All this time, Android #21 has been regenerating, and it finally breaks out of its imprisonment--the being is known only as the powerful "Cell" and he sets out to accomplish his creator's commands.

Frieza Saga
The Freeza series has boosted the popularity of Dragon Ball Z greatly. It is a crucial turning point in the Dragon Ball Saga, because it involves Goku's very first transformation into the legendary "Super Saiyan"(which comes every 1000 years) with the ability to power up to a golden-haired strenghtened stage. It also introduces the character Trunks at the end, as well as explain more story and plot that occured prior to the start of DragonBall.

Epilouge: events that happened before the Freeza Series
Years ago, Freeza killed Vegeta, the Saiyan king, and destroyed the Saiyan Planet Vegeta. Then he used prince Vegeta(King Vegeta's son and the Vegeta we know and love), Nappa, and Radtizu as mercenary-slaves to conquer other planets. After the Vegeta Series only two pure breed Saiyan were left. One was the Saiyan Prince, Vegeta. The other was Bardock's son, our main hero, Gokou. After the death of Raditz, Vegeta learns from the message from Raditz's scouter that Dragonballs existed. Later, he figured out that in Namek Dragonballs also existed. After getting beaten by Gokou, Vegeta retreats to Freeza's planet to recover. Now, he carries on the new goal of gathering the dragonballs for himself to be granted the wish of immortality. He also plans to kill Freeza. Freeza is also in search of the Namek Dragonballs to become immortal and begins to terrorize Namek for the dragonballs. Meanwhile, Bulma learns about the Namek Dragonballs via PoPo, Kami's assistant. With the hope to gather the dragon balls to wish their friends killed in the Vegeta Series back to, Gohan, Klilyn, and Bulma venture off to Namek on the spaceship that Kami rode on to travel to Earth years ago. Great battles on Piccolo's home planet are to take place.

Right after the Vegeta series takes place, Freeza-an interplanetary conquerer or planets, makes his apperance on the Planet Namek and begins to collect Dragon Balls. Gohan, Kuilin, and Bulma all go on a spacecraft to investigate, while Goku remains in th e Hospitol, recovering from the wounds from the fight with Vegeta. The storyline before Freeza Arrives is a long and complex one, so it may be explained later on.

Anyway, once on Planet Namek.( Planet Namek's residents all look like Piccolo.)-Vegeta discovers Freeza's(Vegeta and the rest of the Saiyans are Freeza's sworn enemy) whereabouts so he goes over to Namek to try to gather the Namek Dragon Balls as well to wish for immortality. (The Namek Dragon Balls give an individual 3 wishes as opposed to 1 wish on earth.). Freeza begins to conquer Namek, sending out his henchmen, Zarbon and Daoduiba, to gather the DragonBalls and terrorize and destroy the Namek Villages. Meanwhile, our heroes Gohan and Kuilin are having trouble themselves, but finally meet up with the Namek village elders and team up with the Nameks to help. They meet Dende, a very helpful young Namek that serves as a guide around Namek.

Goku recovers from the hospitol thanks to one of Ubujji's magical beans, and springs into action with help from Dr.Brief (Bulma's Father) and his invention. He boards a training capsule heading to Namek, where he plans to train on his way there under certain Gravity Forces several times that of earth. Along the way, he encounters some tough terrain and eventually ends up in a Gravity Storm which throws him into G-level 100. He fights it and eventually becomes strong enough to train in it.

While in Namek Vegeta, Gohan, Kuilin and Bulma all face the problem of gathering the DragonBalls. Vegeta has the upper hand, after he raided Freeza's base and stole 5 of them. The plot gradually continues...with the summoning of the Ginew Force, an elite warrior team composed of Freeza's best henchmen, and they are taken care of by the combined forces of Vegeta and Goku-(there leader can switch bodies, and a frog is thrown in the path of his mind laser, where he gets stomped afterwards)...until Goku finally reaches Namek, all trained and ready.

Then, the battle of Freeza finally begins!!! When they first battle, Freeza reamains in Normal Form. Then, as the battle progresses both fighters energy levels increase, and Freeza changes into 4 different forms during the battle. He begins with 530,000 while Goku has 550,000 BP. After fighting, Frez a i ncreases to 700,000 in Form2, then 870, 000 in Form 3. Goku's max powered-up rises him up to 800,000--being barely able to confront Freeza Form 3. Freeza ultimetely transforms into Perfect-Form, with a smooth metallic look and incredible strength. ( 1,200 ,000 BP!!). Goku's rage rises, because his good friend Kuilin has been killed in battle-and he finally recieves enough power and anger to unleash the Super-Saiya-jin!!! as he blasts up to a whopping 1,500,000 BP with flowing gold hair and a bursting energy field around him. But it still seems Freeza has another transformation well sort of. Freeza powers up to 100% he was currently fighting at only 70%. It seems Freeza has the upper hand but not for long, the longer Freeza fights at 100% the faster he loses his power. Freeza attacks Gokou with a Slicing disc but instead he cuts himself. Freeza is now incredibly weakened, and Goku finishes him off with a fireball.

Now he has to race against time to escapes just before the planet explodes because Freeza had use his Death Ball Attack on planet Namek before he died.Goku's whereabouts are unknown, and everyone believes that Goku has died. In the last mili-second Gokou finds finds the Ginyu's Pods and escapes. Our hero has traveled to the planet Yardrat to learn the art of teleporting! The DragonBalls are gathered, everyone who died is revived and they all return to living a peaceful life.

Trunks Saga
In Frieza's robotic self, he was now at a point that he can attain unimaginable power, that in his "purely organic" form would have killed him. The first thing he told his father upon reawakening, was that they were going to Earth to kill the Saiya-Jin that did that too him..

Upon arriving on Earth, King Kold and Frieza scan the horizon and decide that since Goku would not be coming for some time that they should give him a warm welcoming. Except that their idea of warm was killing all of Goku's friends and being the only ones to welcome him. As Frieza looks around at the top of a hill, he is stunned by an image of Goku. But this fading image mildly frightens him and he charges up. His father jokingly asks him why he is so anxious.

Meanwhile, the Z-Fighters feel Frieza's ki and prepare for him. Gohan throws on his Saiya-Jin armor and everyone meets up, stun that he could still be alive. All believing that Goku had destroyed him. Under the orders of Vegeta everyone did not fly and kept their power levels low. Because Vegeta knew that Frieza's men would pick them up on their scouters. So they walk towards the area where Frieza's ship landed.

Frieza and his father look around and call out their men. All of a sudden a teenage boy comes down from the sky. He's dressed in a Capsule Corp. jacket and a sword on his back. He confronts Frieza. Frieza is stunned that this strange young boy, named Trunks, knew his name. And even worse yet he knew Goku! Frieza orders one of his men to scout him. The scouter shows Trunks with a power level reading of 5. So a goon is told to fire at him. Trunks is shot at and easily throws both of them behind him and into the mountains. Other goons are ordered to attack Trunks. They are warned not to underestimate Trunks, but they continue. In a quick movement and swift sword strokes all the men fall to ground in pieces. Also another guy who is looking through his scouters gets his armor split along with his scouter. He backs off, but is shocked to see Frieza's hand, but not in front of his face, but rather through his stomach.

This teenage boy has a surprise for Frieza, he too is a Super Saiya-Jin, and he's not as nice as Goku. With this news Frieza's is scared, but him and King Kold do not believe him. So Trunks goes on to show him. With a violent scream and dead bodies flying all around, Trunks transforms into the Green eyed, Blonde haired Super Saiya-Jin. Frieza looks at him and is stunned, "Those eyes...they have the same eyes!" He says as he has a flashback of Goku and his eyes.

Trunks challenges Frieza and he launches an attack against him (Trunks). Eventually, Frieza throws a Death Ball 10 times larger than the one that destroyed Namek, at Trunks. The ball sinks into the ground and Frieza thinks that he has won. But the ball lifts out of the ground and Trunks his holding it. Frieza launches a ki blast at it and the ball becomes unstable, so Trunks throws it into space. Trunks gives Frieza one more chance to attack, Frieza fails so Trunks sits atop a mountain and blasts Frieza, he misses and then we hear Trunks call out to Frieza, when he looks up Trunks slices him into several large pieces and then into smaller pieces and then finally blasts him into dust.

King Kold, being totally shocked that someone effortlessly defeated his son, makes him an offer to be at his side as his new "son" or heir. But Trunks turns him down. King Kold asks to examine his sword, but upon Trunks giving it to him he tells Trunks that he could not have defeated his son had it not been for that sword. He turns the sword upon Trunks and attempts to slice him, but the swords blade is caught and King Kold is blasted and killed.

Eventually after Trunks destroys Frieza's ship, the Z-Fighters come out and are a bit fearful of Trunks, not being too sure what side he was on. But Trunks is friendly and invites them to come with him to go and greet Goku when he comes back. So the Z-Team along with Bulma goes with him very cautiously though!

The Z-Fighters are a bit wary of the strange teen who so easily destroyed both Frieza and King Kold, for they were unsure of which side he was on. But Trunks was warm and friendly. With a smile he told them he knew where Goku would be landing in 2 hours. The others follow him to a desolate spot. Unknowing about this mysterious youth, the others agree that he was a friend of Goku's. But Tien disagrees saying they've know Goku all their lives and never hear or saw this guy. Bulma says that maybe he met him in space.

At the spot where the boy said Goku would land (at this point no one knows his name) he pops out a capsule and it pops up into a Capsule Corp. refrigerator. This is the time where Bulma notices that he is wearing a Capsule Corp. jacket and asks if he works for the company. "No, I'm just a fan." He replies

"Well, give me my name, and I'll tell my father about you." Bulma says cheerfully.

Trunks responds that he cannot tell them his name. So Tien and Yamcha make fun of him, saying that they want secret names too! Trunks is then interrogated by everyone. He is asked if he really turned Super Saiya-Jin when he fought Frieza. He tells them that he is a Super Saiya-Jin. Vegeta is utterly full of rage and tells them that Kakarot (Goku), himself, and the half-breed (Gohan) are the only Saiya-Jins. Making the Saiya-Jin population 3.

So they wait and wait for Goku to arrive . As the time goes by, they wonder where he is and how this guy knows him. Then at once everyone feels Goku's ki. Appearing in the air a space pod that crash lands close by creating a crater. Out of the pod steps Goku, dressed in weird clothing. Goku ponders how they knew he'd arrived their and he asks who defeated Frieza. He suspects Piccolo and Frieza, but Piccolo tells him it was the kid and that he's a Super Saiya-Jin. Goku is amazed and says that it is great and that he's so young too! Then Bulma tells him that he claims to know you. Goku is taken aback saying that he has never met that person ever.

Goku tells the group of how he escaped from the exploding planet. He tried to use Frieza's ship, but it was broken. As the ship fell into the planet he flew to a falling space pod and in a desperate attempt hit a button that sent him flying to Planet Yadratt. Vegeta says that the Ginyu Force must have been planning on going there next, but never arrived, and programmed it into their pods. Here he was nursed to health and trained with them. Also he learned a new technique, but keep reading for that.

When Goku is introduced to him, Trunks tells Goku that he wants to speak to him privately. So they fly off to speak together. When they land, far enough so that no one can hear them, Goku thanks Trunks for killing Frieza. Goku said that Frieza's ship was faster and that he thought he killed him on Namek. Trunks replies, "You were supposed to, but there was a problem with timing." Goku tells him that he could've caught up to him though. Trunks is puzzled by this saying that Goku was three hours behind him. But Goku tells him that he learned a new technique that he can travel anywhere in the universe by locking onto someone's ki. Trunks is shocked saying that he didn't know Goku learned a new technique. Then Goku is asked by Trunks if he can turn Super Saiya-Jin at will. Goku answers him by telling him that at first he couldn't but now he can do it easily. So he (Trunks) asks Goku to turn Super Saiya-Jin. Goku transforms, then so does Trunks. They stare at each other, amazed at how similar they look.

Meanwhile, the others look on in amazement. Shaking at the feeling of their kis. Vegeta is very jealous and Piccolo is straining his ears to hear what is going on.

In the blink of an eye, Trunks' mighty sword is out of it's sheath and coming full speed at Goku's face. They sword stops within an inch of Goku's face. "Why didn't you dodge?" Trunks says very surprised.

"I knew you had no intent to kill." Goku calmly replies.

So Trunks tells Goku that this time he'll attack and he wants him to block it. Goku nods and charges up his index finger. A vicious attack is launched by Trunks and every blow is blocked by Goku's one finger. The same blows that killed Frieza were nothing to the mighty Super Saiya-Jin.

A breaking news to Goku, that Trunks is son of Vegeta and Bulma and that's why he can go Super Saiya-Jin. He says that he'll be born in 1 year. Goku is amazed, but Trunks tells him they cannot know or else he'll never be born. Also Trunks says that that is not the real reason he came.

Trunks now sees that Goku is as strong, if not stronger than he has heard. He asks Goku if he can keep a secret and Goku jokingly replies, "I don't talk much." So Trunks tells him everything. His name, about the Androids that will take over the world in three years, and about how in his time everyone is dead. Tien, Chiaotzu, Vegeta, Piccolo, Krillin, and Yamcha all die in a battle against the two Androids. Gohan escapes the battle and trains Trunks. Goku asks where he is. Trunks tells him he's dead and that he never gets to fight the androids. That soon he'll catch a heart virus that not even a Super Saiya-Jin can fight.

Also, Goku asks about the androids. Trunks tell him they are two powerful beings created by Dr. Gero, head robotic scientist for The Red Ribbon Army. The group Goku killed as a child. He has had revenge on his mind ever since. But the androids destroyed Dr. Gero after he released them and went on a murderous rampage taking over the world of his time.

He tells of how Gohan trained Trunks, but was killed in a battle with the androids. Trunks warns Goku not to underestimate them, as their energy is infinite and they are strong. They will appear in 3 years, 9 miles southwest of South City.

Before Trunks leaves for his time, he gives Goku an antidote for the heart virus. In this time there was no cure, but in Trunks' time there is. Trunks leaves for his time to face the androids of his time. He bids his young mother farewell and wishes them all good luck.

With Goku returns to the others and is bombarded with questions. He vaguely answers their questions. But Goku forgets that Nameks have super hearing and Piccolo heard everything. He promises not to reveal the young warrior's secret. So he tells of the Androids, the boy from 20 years in the future (but not his name or parents) , Goku's heart virus, and how they all die in battle against the androids.

Goku wants to show them the new technique he learned, Instantaneous Motion (He learned on Planet Yadrat). So he says that he can travel anywhere he wants as long as he can lock onto someone's ki. He says he found someone and disappears and then reappears wearing sunglasses. Vegeta says, "That's nothing, it's just super speed." But everyone realizes those are Master Roshi's and he's thousands of miles away!! Goku hands the glasses to Krillin.

Piccolo then reminds everyone about the androids. Goku, Piccolo, and Gohan decide to train in the mountains together. Chiaotzu and Tien choose to train together. Yamcha opts to train by himself and Krillin decides to train with Master Roshi.

So they all depart to prepare for the battle of their lives