In "Laundry Day", the Slime Monster was seen destroying Jump City until it was confronted by the Teen Titans. The Titans tried everything they could to defeat it, but earned little success. Finally, Robin threw an exploding Bird-a-rang at the monster, which blew it apart, creating a gelatin block around the Titans and staining all of the Titans clothes.
The Slime Monster is a slimy green blob that has yellow eyes, angry black eyebrows and yellow pointed teeth.
- "Laundry Day" (debut)
- "Garage Sale" (cameo)
- "The Inner Beauty of a Cactus" (cameo)
- Its color scheme is very similar to the Synthoriod from the Justice League episode "Metamorphosis".
- It is also very similar to Chemo from Batman: The Brave and the Bold and the Metal Men shorts.