Quick recap
In Hell, Dr. Myuu and Dr. Gero team up and create a new Android 17. He opens a passage between Hell and Earth, and old villains like Frieza and Cell come back. Goku goes down to Hell to fix it, while Earth's 17 is manipulated and kills Krillin. The two Android 17s fuse into Super 17, who absorbs energy and floors Goku after he makes it back. Android 18, devastated by her husband's death, attacks Super 17 and opens a gap. Goku, as a Super Saiyan 4, punches through the villain with the Dragon Fist. But all the wishes have left cracks in the Dragon Balls, and something dark is about to come out.
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