It's a 20-Fold Kaio-ken! A Kamehameha with Everything on the Line Dragon Ball Kai: Doragon bôru kai : Season 1 Episode 45

After suffering a savage beating at the hands of Frieza, Goku summons the awesome power of the Kaio-Ken! If his desperate attack succeeds, victory will be his, but if it fails, the Saiyan race will be eliminated!