Yoko (voiced by Katie Griffin) is a very beautiful 15 year old karaoke-loving Wannabe pop singer (who can't carry a tune) sees Galaxy High as just a step on her way to stardom. Her main weapon is her sonic blaster. Yoko's terrible singing is a running gag in the show, and despite how bad it is, she wins many interstellar competitions with it (Aliens take her voice as music while Josh and Brett start crying in pain.) Often, she is distracted on missions when a talent competition, or something that could boost her career pops up. Despite her beauty, Yoko's desire for stardom and fame often lead to her capture or place the group in danger. She had a crush on Seth, until she heard his voice..
- Yoko loves her hair and hates anything bad to happen to it. As seen in Intergalactic Exchange.