The Hyperbolic Time Chamber is where Goku, Gohan, Vegeta, Trunks, and Piccolo went to train in preparation for the Cell Games, allowing them to ascend to new levels of power they could previously ...

This shows how Gohan was able to ascend into a Super Saiyan after training with Goku in the Hyperbolic Time Chamber. This is when Goku saw Gohan's potential to be the first one to evolve beyond ...