The Sewer Thing is the twenty-third episode of the first season of the animated series, Martin Mystery. It was originally released on June 8, 2004.


Martin, Diana & Java discover that a hideous creature living in the city’s sewers of Ottawa, was once a man who accidentally became “infected” by an experiment at a top-secret genetics laboratory. Now, because of his grotesque mutation, he’s bent on revenge and must be stopped.

In a sub-plot Diana application to join Famous sorority: The Sai Sai Sai Sisterhood in rejecting, due to her lack of tolerance and was given a chance to join under the condition she must tolerate Martin behavior for a full day. However near the end when it was discovered that Martin is the senior advisor of the Sisterhood Diana lose her temper and one once again rejected.




  • Psi Psi Psi Sorority Girls (ΨΨΨ)
  • Dr. Trevor Schindler
  • Dr. Roberta Frisk
  • Dr. Maurice Muncey


  • Al Rizzo (Rat Man, formerly, but reformed)

Gadgets Used


  • Slime Scan
  • Alpha Goggles
  • Bio Scan
  • I-Cutter


  • Rat Man's last name was used from the character, Rizzo the Rat, from the franchise of Disney & Jim Henson's The Muppets.