Dragon Ball Kai Episode 45 - "It's a 20-Fold Kaioken! A Kamehameha With Everything on the Line"
Ginyu tries to steal Piccolo's body, but is foiled by Gohan who throws the frog body back in the way, restoring he and Bulma back to the way they were. Meanwhile, Goku continues to be thrashed by Frieza. However, he sees a vision of how Frieza could destroy everything he knows and loves - and finds a new level of strength as a result of the 20x Kaioken! Goku lets loose with a massive Kamehameha that even Frieza himself has difficulty deflecting! Unfortunately, it isn't enough and Goku quickly finds himself of the receiving end again. Once again, he begins seeing a vision, this time of Vegeta and other Saiyans of the past, including his father Bardock. Motivated once again, he lunges at Frieza, powered up.