Ms Tabitha Leon is one of the more unusual teachers at H.I.V.E. as her consciousness was trapped in the body of her fluffy, white cat as the side-effect of one of Professor Pike's experiments. Ms Leon has refused to forgive Pike and often argues with him to the annoyance of Dr. Nero.

Leon teaches Stealth and Evasion classes, her star pupil being Shelby who is extremly good at the classes. Ms Leon has no worries about giving detention to any students. She has designed the prison cells at H.I.V.E. making them completly impenetrable. Though she would never admit it she sometimes finds her cat body very useful; her human body is currently in frozen cyrogeny.