The Monster attacked Jump City in the episode "Dude Relax". After putting a shock collar around Robin's neck to force him to take a day off, Starfire, Raven, and Cyborg confronted and battled it in the heart of the city. However, they were not victorious, and failed instead. They frantically called Robin for back-up, but he chose not to answer. Also, Beast Boy did not help because he replaced himself with a random animal he painted green so he could also take the day off. The Titans then failed their mission.
- Dude Relax (debut)
- Some of Their Parts (cameo)
- The Giant Mutant Octopus is the first villain to successfully defeat or capture the Teen Titans.
- He appeared on a few promotional pictures of Teen Titans Go!.