Episode 77, "Super Saiyan Surpassed! The Daring Vegeta Strikes Cell"
Synopsis: Goku and Gohan enter the Room of Spirit and Time. Gohan is astounded by how vast the inside area is. Cell continues to destroy islands in his attempt to flush out Artificial Human 18. With only one island left in the area, Cell threatens the island 18 and 16 are hiding on. However, before he can fire at it, Vegeta arrives. Confident, he boasts that he will completely destroy Cell. Trunks also arrives, but Vegeta says that he'll just be observing. Vegeta powers up, his body bulking up. Cell is astonished. Vegeta punches him hard in the stomach, hurting him. Then he continues to attack, easily overwhelming him. Vegeta tells Cell to get serious. Cell is unable to land a hit. Kuririn approaches the island, detecting Vegeta's ki. Goku tells Gohan that the first step to training is to make him a Super Saiyan. Gohan is unsure he'll be able to reach that level. Goku assures him he can, announcing his intention to get Gohan to surpass himself. Vegeta continues to beat up on Cell, who starts putting up more of a fight. However, Vegeta is able to endure any attack.
4 out of 5
P.S. I really love the piece of music they used when Goku was talking to Gohan about making him a Super Saiyan. It really captured the feelings of the moment. It wasn't very DB-ish, but it was great nevertheless.