Spoiler-Safe Summary

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Cell completes his transformation into his ultimate form, impressing and intimidating those around him. Meanwhile, Gohan and Goku train intensely, leading to significant developments in Gohan's power and resolve.

Full Plot Summary

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Dr. Gero's dream has been realized, as Cell begins his final transformation, with everybody but Vegeta, who has realized his own dream of testing his strength, looking on in fear. After Cell becomes complete, he begins testing his new body, as Krillin and Trunks attempt to subdue him. Eventually, Cell tests one of his kicks on Krillin, knocking him out cold. Up in the Hyperbolic Time Chamber, Gohan and Goku are still training. Gohan becomes tired of being treated like his father's son, and wants Goku to give it everything he's got. Goku complies, transforms to a Super Saiyan, and unleashes a powerful Kamehameha wave at Gohan, who, while fighting it, realizes how he has let people down his whole life, and finally transforms into a Super Saiyan, albeit maintaining the transformation only for a few minutes.