Do or Diner is an otherworldly eatery located somewhere in the Netherworld.
During the First Annual Ghostbusters Grand Prix, the Ghostbusters and Slimer became lost in the Netherworld. The Do or Diner suddenly manifested. The guys decided to go inside and ask for directions. However, the cook refused to help any humans. The patrons agreed and got up to deal with the Ghostbusters. The guys promptly vacated the diner and drove away.
- On page 10 of Ghostbusters Volume 2 Issue #3, Do or Diner makes a non-canon cameo to the far right.