Marvin is a character who first appears in the episode "Gary & Spot."
He is a green fish with brown hair on each side of his head and purple lips. He wears a gray shirt with a gold name tag on it, dark gray pants, a brown belt with a gold buckle, brown shoes, and a small dark gray hat.
Role in series
Marvin has only made 2 appearances in the series so far with both of them being major appearances. He is an animal control officer that works at the animal shelter.
"Gary & Spot"
When Gary is eating Squidward's trash, Marvin arrives in his van to capture him. However, Marvin slips on some of the trash and gets tangled up in his capture pole, causing Gary to laugh and quietly leave as Marvin tries to untangle himself. Later, as Gary and Spot are making a mess in the Krusty Krab, Marvin passes by in search of Gary and notices the lights on. He barges in on the two pets and slips on some food, giving Gary and Spot time to leave. Mr. Krabs then arrives, due to the ruckus triggering his silent alarm, and Marvin explains that he is hunting a snail. However, Mr. Krabs complains about the messy state of the Krusty Krab and attacks Marvin, believing him to have caused the mess. Soon after, Gary and Spot are partying with Patrick and some other animals in a shipwreck when Marvin notices the lights and music. He goes inside and dances, before realizing he is surrounded by the wild animals. After a fight, he arrests them and puts them into his van, before leaving. Gary and Spot, who managed to evade Marvin, decide to follow his van and rescue the other animals. The two track Marvin to the animal shelter, where they break in and release the trapped animals. However, Gary and the animals overhear Marvin bemoaning how lonely he is and decide to help him. They set up a romantic date for him, and Gary uses slime to create a girlfriend for Marvin. Marvin then takes his girlfriend on several dates and they soon get married. He thanks the animals for their help before setting them free.
He appears at the animal shelter with SpongeBob volunteering and gets a call from Squidward about a loose worm barking around his house. He goes out to catch the worm and bring it back to the shelter, but the said worm is later revealed to be Patrick who has recently gone into worm mode when Marvin brings him to the animal shelter. He tells SpongeBob if Patrick doesn't learn to behave, he will need to be locked up like Butcher. SpongeBob tries to train Patrick himself but it doesn't end up working. Marvin then claims that Patrick is a menace and threatens to have him locked up like Butcher once again. SpongeBob then decides to adopt Patrick and take full responsibility for him. Later on in the episode after SpongeBob made Squidward train Patrick with tough love, Marvin arrives at Squidward's house and says that SpongeBob has told him that he has been using tough love to train Patrick. Squidward then tells Marvin that Patrick is impossible to train but Patrick suddenly starts obeying Squidward which causes Marvin to believe that Squidward is an expert trainer and then has Squidward train Butcher, much to Squidward's dismay.