Sabrina: The Animated Series (1999)

S1E2 You Said a Mouse-ful

When Salem devours the mouse meant for Sabrina's science project, Sabrina decides to transform him into a mouse to serve as their lab rat for the upcoming science fair. However, NASA mistakenly believes Salem, in his new form, is an exceptionally smart rodent. Excited by the prospect, they plan to send him into space!