Dragon Ball - episode 38 - 11 Nov, 1986

Goku recovers from his injury and begins to chase Murasaki. Murasaki, then Goku, cross a piranha invested lake. Murasaki decides to use his ultimate technique and seemingly splits into five. The five Murasakis nearly overwhelm Goku. They reveal that they are actually quintuplet brothers, not five parts of one person. Goku takes them out one by one. He chases the last Murasaki brother up to a cage. The ninja releases the monster within, Android 8. (Source: Wikipedia)