Goobster is a character that appears in the Adventures of Sonic the Hedgehog television series. He is a creature from another dimension that accidentally got transported to Mobius during a lightning storm. He has a huge appetite for chili dogs and will devour everything he can until he has eaten a sufficient amount of them.
When Goobster was transported to Mobius, he saw Sonic run by, so he followed him. When Sonic and Tails discovered him, Tails decided to keep him as a pet. Goobster helped the heroes defeat Scratch and Grounder but then got hungry and started sucking up everything until Sonic gave him his retirement chili dogs.
Sonic was angry and decided Goobster was too dangerous to keep and they have to send him back to his own dimension. Before they could do this, Goobster was kidnapped by Scratch and Grounder and taken to Robotnik. The evil doctor tried to use Goobster's great power against Sonic and Tails, but they were able to free him and escape from Dr. Robotnik's fortress. Another lightning storm hit and the inter-dimensional portal re-opened and Goobster went through and returned to his parents.
- On the DVD, Robotnik Strikes Back, the back cover introduces Goobster as "Walter" for unknown reasons.