General information
Season No. 1
Series No. 1
U.S. Air Date September 9, 2000
Directed by Timothy Björklund
Written by Bill & Cheri Steinkellner
Episode chronology
Previous -
Next Pet Project
Muttamorphosis is the first episode of Teacher's Pet from Season 1. It was directed by Timothy Björklund and written by the series co-creators, Bill and Cheri Steinkellner.


Spot Helperman is tired of staying at home and waiting for the masters to return from his owner's daily journey to school, so he disguises himself a boy named, "Scott Leadready II" and sneaks into Leonard's classroom. When Leonard finds out who Scott truly is, their rivalry begins, with Spot, Leonard, and Ian running for class president.


Voice actor Role(s)
Nathan Lane Spot Helperman/Scott Leadready II
Shaun Fleming Leonard Helperman
Debra Jo Rupp Mary Lou Helperman
Jerry Stiller Pretty Boy
David Ogden Stiers Mr. Jolly
Wallace Shawn Principal Strickler
Tara Charendoff Unknown role (see Notes section)
Rob Paulsen Ian Wazselewski
Pam Segall Tyler, Taylor and Trevor
Cree Summer Chelsey and Kelsey
Lauren Tom Younghee Mandel-Baum
Mae Whitman Leslie Dunkling


The credits for this episode can be found here.


  • In the original airing, Pretty Boy says "Your disguise looks like something some guy created off a comic book." This is referring to the Superman franchise which was an inspiration for Spot's "Scott" costume. Gary Baseman knew how absurd it was that everyone was too ignorant to tell Clark Kent is Superman because he wears glasses, and so that was incorporated in Scott's attire. Pretty Boy's line was cut in later airings, possibly for time.
  • Interestingly, Wallace Shawn was given star billing in the credits of this episode, though every episode after this one puts him in the additional voice talents section. This implies that Principal Strickler was originally intended to have a larger role in the show.
  • Tara Strong (who at this point was known by her maiden name "Charendoff") appears in this episode, though it is unclear who she plays exactly. She may have been an additional voice in the classroom, or her character may have been cut from the final episode.
  • Moral: Always be a good friend and support them.


  • When Mrs. Helperman is about to announce the winner, Scott is standing in front of the class next to Ian and Leonard. When she finally announces the winner and the entire class cheers, Scott can be seen sitting at his desk cheering along with the rest of the class. Afterwards he's back at the front of the class standing next to Leonard.
  • In the scene where Spot was picking Leonard's clothes to wear for school, the red shorts were mistakenly colored green in one frame.
  • Leonard's hair changes back and forth between orange and blue in one scene.



  • There is an English recording both online and a better quality version of it as a special feature on the Teacher's Pet: The Movie DVD. A Russian dub has also been found, although the sound is poor, with white noise constantly going on in the background 1.
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