Filch's submarine

Filch's submarine appears in the episode Raphael Meets His Match. Filch uses it for high-tech sea piracy, and the submarine carries the Jolly Roger pirate flag.

was a Human college student, who ended up kidnapped by Filch when she was out fishing with her friends. Because she'd studied physics, he tried convince her to assist him. When she tried to ruin his plan by destroying the laboratory, she ended up transformed.