Mutant Muck Monster is the toy Arthur gets from Grandma Thora, in Arthur's Toy Trouble. This toy was bought at David's Toys and was found in the bargain bin. The cost of this toy was $6.47, but Freddy K. said it was only $5 after 10 years. Which means the toy was probably only worth a 💵. The toy was a defect, and Arthur, Buster, D.W., and Muffy thought it is worth 2 million dollars!

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.