Teenage Mutant Ninja Turtles Season 4 Episode 20
Were-Rats from Channel 6
Professor Lloyd Cycloyd, a crazy scientist who escaped from an institution, accidentally discovers the Turtles' lair. He sees Donatello testing out one of his new inventions, a time stopper.
4 - 41Episode 41Dec. 22, 1990- 4 - 40Episode 40Dec. 15, 1990
- 4 - 39Unidentified Flying LeonardoDec. 08, 1990
- 4 - 38The Foot Soldiers are RevoltingDec. 08, 1990
- 4 - 37Big Bug BlunderDec. 01, 1990
- 4 - 36Beyond the Donatello NebulaDec. 01, 1990
- 4 - 35Raphael drives 'em WildNov. 24, 1990
- 4 - 34Splinter VanishesNov. 24, 1990
- 4 - 33Leonardo VS TempestraNov. 17, 1990
- 4 - 32The Big Cufflink CaperSep. 14, 1990
- 4 - 31Donatello's DegreeSep. 08, 1990
- 4 - 30The Dimension X StorySep. 08, 1990
- 4 - 29What's Michelangelo Good For?Nov. 10, 1990
- 4 - 28Poor Little Rich TurtleNov. 10, 1990
- 4 - 27Michelangelo Meets BugmanNov. 03, 1990
- 4 - 26Rhino-ManNov. 03, 1990
- 4 - 25Rebel without a FinOct. 27, 1990
- 4 - 24Farewell, Lotus BlossumOct. 27, 1990
- 4 - 23Donatello Makes TimeOct. 20, 1990
- 4 - 22The Big Zipp AttackOct. 20, 1990
- 4 - 21Funny, They shrunk MichelangeloOct. 13, 1990
- 4 - 20Were-Rats from Channel 6Oct. 13, 1990
- 4 - 19Leonardo Lightens UpSep. 29, 1990
- 4 - 18Slash the Evil Turtle from Dimension XSep. 29, 1990
- 4 - 17Raphael Meets his MatchSep. 22, 1990
- 4 - 16Bebop and Rocksteady Conquer the UniverseSep. 22, 1990
- 4 - 15Raphael Knocks 'em DeadSep. 15, 1990
- 4 - 14Son of Return of the Fly IISep. 15, 1990
- 4 - 13Back to the EggSep. 26, 1990
- 4 - 12Superhero For A DaySep. 25, 1990
- 4 - 11Menace, Maestro PleaseSep. 28, 1990
- 4 - 10Name That ToonSep. 21, 1990
- 4 - 9Planet of the TurtlesSep. 20, 1990
- 4 - 8Rondo in New YorkSep. 19, 1990
- 4 - 7TurtlemaniacSep. 18, 1990
- 4 - 6Four Turtles And A BabySep. 17, 1990
- 4 - 5Shredder's MomSep. 14, 1990
- 4 - 4Peking TurtleSep. 13, 1990
- 4 - 3Michelangelo Toys AroundSep. 12, 1990
- 4 - 2Turtles of the JungleSep. 11, 1990
- 4 - 1Plan Six From Outer SpaceSep. 10, 1990
