"The Strongest Super Saiyan! Trunks' Power Unleashed!" (超パワー覚醒！父を超えたトランクス Chō-Pawā Kakusei! Bejīta o Koeta Torankusu, lit. "The Awakening of Super Power! Trunks Has Surpassed his Father Vegeta") is the eighty-second episode of Dragon Ball Z Kai. This episode first aired in Japan on November 21, 2010. Its original American airdate was October 20, 2011.
Summary
Trunks powers up to Super Saiyan Third Grade
Future Trunks and Cell seem to be evenly matched at first, but after a while Trunks' attacks cease to hit Cell. So, Trunks decides to Power Up even more, but he is still unable to connect his attacks to hit Cell.
In the Hyperbolic Time Chamber, Goku manages to power up to the same level of power as Trunks, but decides not to use that form because in order to achieve that form, even though great power is gained, Goku concluded the decrease in speed is too much (due to the large muscles) and having power but not being able to hit your opponent is useless so he decides to opt for his normal Super Saiyan form.
This turns out to be the same reason why Trunks cannot defeat Cell. Cell learns that Goku is training to defeat him so in order to waste time he decides to hold a martial arts tournament where anyone can enter to fight him, the Cell Games.
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