Oh god, let's just list some bad episodes in chronologial order and I'll sort them out later.
- "Panic in the Sewers"
- "The Pulverizer"
- "Cockroach Terminator"
- "The Pulverizer Returns!"
- "Parasitica"
- "Invasion of the Squirrelanoids"
- "Mikey Gets Shellacne"
- "Mazes & Mutants"
- "Pizza Face"
- "A Chinatown Ghost Story"
- "A Foot Too Big"
- "The Croaking"
- "The Noxious Avenger"
- "Meet Mondo Gecko"
- "The Creeping Doom"
- "The Fourfold Trap"
- "The Weird World of Wyrm"
- "Journey to the Center of Mikey's Mind"
- "Trans-Dimensional Turtles" (I don't care what you have to say, Liquid Snake as Leo does not make it a good episode)
- "The Insecta Trifecta"
- "Bat in the Belfry"
- "When Worlds Collide"
Admittedly, a lot these aren't "bad", just pointless and stupid.