Steffi was a babysitter hired by Pearl Forrester to look after Bobo and Brain Guy while she was away on vacation in Episode 908, The Touch of Satan.

Brain Guy did not take this well, and soon had reason to hate her. Steffi would treat Observer like a toddler, despite him trying to tell her, quite eloquently, that he was of a super-intelligent race. She made him play with children's toys and then sent him to bed with a binkie and blanket. She treated Bobo like a dog; anytime he talked, she reacted as though he was barking and would hit him with a newspaper. She later would lock him in a kennel.

She was a bit unsure about sending Mike and the Bots the movie, but Crow didn't mind being addressed as "Cow".

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