Gareth is a minor character in the episode "One Last Job" of Adventure Time. Gareth is one of the members of Jake's old gang alongside Jake, Tiffany and the Flying Lettuce Brothers.
Gareth is in the middle of a date with Lollipop Girl and hypnotizing her into giving him all she owned. However, he is unsuccessful because Jake's call interrupts him.
He then part takes in robbing the bakers shard to rescue Jake's daughter. Gareth and the other then betray Jake make off with the bakers shard, and drive away in their van. They are soon caught by Jake then let go after he gets Jake Jr.
Gareth is yellow and wears a green-and-red striped tank top. He has black eyes and brown hair. His chiseled facial features and attractiveness may be a reason why he is also known as the Lady Master. He also bears slight resemblance to Ricardio.
- He was voiced by Sam Marin, who also voiced Pops, Muscle Man, and Benson on the TV series, Regular Show.
- Gareth also has the ability to put women under the "spell" of his face and hypnotize them into adoring him. This ability was not used during the break-in in "One Last Job," but only in the beginning when he was on a date with Lollipop Girl.
- Gareth was mentioned in "My Two Favorite People" as one of the many contacts in his phone along with the Flying Lettuce Brothers and Tiffany Oiler.