Season 3-Super 17 Saga
Episode 41-Curtain Call
Goku, Pan, and Majuub enter the 31st World Martial Arts Tournament. Goku is forced to enter the Junior Division, since he is a child again; when he asks Mr. Satan about this, he states it is because of his height, and Pan fights in the Adult Division because she is taller than him. In reality, he doesn't want Pan to end up fighting Goku, and wants Pan to succeed him as World Champion. Goku makes it to the finals, but is accidentally knocked out of the ring by his opponent after being distracted by Vegeta, and loses. Pan makes it to the semi-finals of the Adult Division, but forfeits because she doesn't want to turn out like her grandpa, Mr. Satan. Majuub makes it to the finals against Mr. Satan, and takes the fight seriously. He is about to win, when Buu, from inside of him, tells him to let Mr. Satan win, as Mr. Satan gives the world hope. He gets knocked out of the ring, and Mr. Satan retains the title of World Champion.
Episode 42-Dangerous Union
Trunks shows up at Goku's house badly beaten, and a black hole has suddenly appeared in the sky. When he recovers, he explains that Android 17 attacked him, and said that Dr. Gero and Dr. Myu have demanded that Goku come to hell through the black hole and fight them, or else they will resurrect Cell and Frieza and send them to earth. A reporter on TV says that there are mysterious monsters destroying the city, and they recognize the monsters as everyone Goku has defeated over the years. Goku decides to go to hell and fight. Down in hell, Dr. Gero and Dr. Myu explain that they created a replica of the Android 17 on earth, but altered both of their programming to make them completely loyal. When these two androids fuse together, the resulting Super Android 17 will have unbelievable power. When Goku arrives in hell, Dr. Gero and Dr. Myu flee, and close up the hole connecting earth and hell, trapping Goku inside. Cell and Frieza show up, and now that he's trapped in hell, he has no choice but to fight them.
Episode 43-The Resurrection of Cell and Frieza
Goku begins his fight with Frieza and Cell, and it is clear that Goku is far stronger than both of them combined. He kills both of them quickly, but they come back to life. Since they are already dead, Goku can never kill them. They trap Goku in a cage of energy, and force him down into the depths of hell. There, he is tortured in various ways, finally being trapped in a block of ice. Back on earth, Gohan is fighting General Rilldo, and Rilldo hits him with his metal beam, turning Gohan's right arm into metal. Trunks and Goten are exterminating Saibamen, while Vegeta deals with the new Android 17. The original 17 locates Krillin, Marron, and Android 18. He hypnotizes her, and tells her to join him.
Episode 44-17 times 2
Android 17 kills Krillin, which brings 18 to her senses. She fights, but loses, and 17 heads off to find his counterpart. Down in hell, Goku's body heat weakens the ice enough for him to break it, and once he's out, he uses the freezing machine on Frieza and Cell and then accidentally shatters them. Back on earth, the two 17's find each other and merge together, forming Super Android 17. Vegeta, Trunks, Gohan, Goten, and Majuub all try to attack him, but their efforts are useless. 17 takes each of them down with a single punch. Watching this from hell, Goku asks King Yemma if he can bring him to earth, but it is beyond Yemma's power. Piccolo, however, has a plan, and requests that King Yemma send him to hell; when King Yemma refuses, Piccolo convinces him that he made a mistake by wreaking havoc with numerous energy waves, and is sent to hell.
Episode 45-Picolo's Best Bet
Piccolo's plan is to replicate the method that the two Android 17's used to escape from hell. He telepathically communicates his plan with Dende. They try to send an energy blast to each other at the same time. After several tries, they finally hit at the exact same moment, and another black hole opens up. Piccolo, unfortunately, cannot follow Goku back to Earth, as he must remain perfectly still for the portal to remain open, but assures Goku that it will be all right; he is willing to spend eternity in hell to help his old friend. Accepting, Goku returns to Earth, while Piccolo decides to get in some "target practice" with some of the old villains. Meanwhile, Vegeta, Trunks, Gohan, Goten, and Majuub are losing badly to Super Android 17. The Android turns on Dr. Gero, because Dr. Myu programmed the android to only take commands from him. With Gero out of the picture, he tells 17 to finish them all off. Just as he's about to blast Vegeta, Goku arrives and pushes him out of the way, and turns his attention to Super 17.
Episode 46-Raising the Stakes
Goku and Super Android 17 begin to fight. The battle is clearly in 17's favor, as Myuu has programmed knowledge of all of Goku's techniques and abilities into him; however, Goku transforms to Super Saiyan 4, which Myuu has never seen. He hits 17 with hundreds of energy blasts, but none of them seem to hurt the android. He tries a Kamehameha wave, but 17 makes no effort to get out of the way, and Goku realizes that 17 is absorbing the energy, just like Android 19 did. Now that he can't use any energy blasts, Goku tries to use Instant Transmission to sneak up on 17, but the android can sense where he is going to appear. With none of Goku's tactics working, Super Android 17 conjures a powerful energy ball to finish him off.
Episode 47-The Greatest Surprise
While 17 is distracted by making his energy ball, Goku sneaks up from behind and grabs him. He tries to blow them both up, but when the smoke clears, both of them remain alive. 17 had put up a shield to protect himself, but it also protected Goku just enough to keep him alive. Once again, he gathers energy for his final attack, but suddenly 18 shows up. Her taunts cause 17 to turn and destroy Dr. Myuu. He turns back to kill Goku, but before he can, 18 starts firing energy blasts at him. While 17 is absorbing the blasts, Goku realizes that he is unable to move while absorbing energy and thus vulnerable, and he quickly attacks, punching a hole through him. He finishes 17 off with a Kamehameha wave. Bulma arrives, saying that the earth is incredibly unstable because of the interdimensional portals that 17 and Piccolo opened up. They gather the Dragon Balls to fix this, only to find that they are all cracked. When they call Shenron, black smoke issues from them, and a mysterious new dragon emerges.