You joined the Cell Games after leaving the Time Chamber, joining Goku and Gohan’s side.

After witnessing the death of Android 16, Gohan unlocked Super Saiyan 2, you being one of the first to see Gohan’s potential unlocked, alongside the other Z-Fighters.

You wanted to help Gohan fight Cell, but Goku stops you.

Goku: “Don’t join, you’ll get in the way. I know Gohan can win, I just feel it.”

Gohan: In the background, talking to Cell. “YOU’RE.. GOING TO.. PAY FOR THAT!”