Dragon Ball Z Kai (2009)
S4E18 A Hero's Sacrifice! Last Chance to Save the World!
Episode Overview
Cell is backed into a corner, and in a final act of desperation, he decides to self-destruct, intending to take the entire planet with him. Gohan is torn, unsure of how to stop him, until his father intervenes one final time to help his son find the strength he needs.
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S4