Dragon Ball Z Episode 73: Gohan Defeat Your Dad!!
Episode 73 of 291 of Dragon Ball Z, aired January 9, 1991, 25 minutes. Available with English subtitles and dub where released.
Episode summary
After taking control of Goku’s body, Captain Ginyu turns his attention to Gohan and Krillin! With Goku trapped in the Captain’s broken body, it’s up to Gohan to stop the rampaging Ginyu! Source: crunchyroll