Radioactive Man trapped in the Oblivious Zone.

The Oblivious Zone is a fictional dimension in the Radioactive Man universe. Anyone in this zone can walk around on Earth as normal, but nobody on Earth will have the ability to see or hear them.

Dr. Crab trapped Radioactive Man in the Oblivious Zone at one point. For a time it appeared Radioactive Man would end up stranded there eternally. While there, he heard his colleagues in the Superior Squad badmouth him behind his back. Radioactive Man eventually escaped and returned to Earth with few long-term effects, but as a result of the badmouthing, he continues to hold a grudge against Captain Squid.[1]


  1. Simpsons Super Spectacular #9