Eriszona is a company, run by Eris seen in The Firebird Sweet.
When Billy got his new cereal box, out popped one of Eris' phoenixes. The group had to go there to solve Billy's problem with the phoenix. A pink monster named Thud also works there. Thud didn't answer what Grim was saying about the box and he kicked him out. By the end of the episode, Eris got flown out of Eriszona. While Thud stayed at Billy's House.
- The company itself is also a pun on the name of one of the USA states, Arizona.