Marty and Lenny

Marty and Lenny are the secondary antagonists in the 2016 animated film, Uncle Grandpa: The Movie.

Role
Martin went to the Park, first seen disguised as a health inspector. After "inspecting" and spotted the UGRV, he spray-painted the door of the trailer after taking one look at the inside, and plans to take it to the dump, leaving Uncle Grandpa upset. However, Mr. Gus tells Martin that Uncle Grandpa need 24 hours to get the trailer "up to code", to which Martin accepts. His friends pitch in and work day and night to perfect the trailer.

The next day, Martin comes to dark tower, arrives with his two henchmen, Lenny and Fishhead. He is overall impressed with the hard work they put into the trailer, but he says he still has to fail Uncle Grandpa, reveals his plan to get revenge on him for sending him and the other trolls to the dark place. As he points out the parts of the trailer that are not up to code, the henchmen intentionally cause those parts to be in that state (including himself). Pizza Steve punches Martin in the face, not wanting to let go of his trailer.

The trolls, however, point out to Uncle Grandpa that they are aware of his magic mustache, and want him instead of the RV. Cleverly, through Angry Grandpa's commands, Martin render Uncle Grandpa unconscious and tie him up to their boat, pushing it back into the sea to sail towards the castle, when Lenny trading him and Uncle Grandpa's mustache for the RV.

The trolls confront Mr. Gus and tells him just that, breaking Pizza Steve's heart. Martin then prepare to kidnap Giant Realistic Flying Tiger, planning to cut off her fur to make a fortune for the coat, while Lenny prepare to kidnap Uncle Grandpa, planning to rip his mustache, and using him to make a fortune.

Later, Martin and Lenny attempts to destroy Uncle Grandpa by push down the waterfall before he does he punched Uncle Grandpa half to death. Then, Martin was going to stab Uncle Grandpa, as Lenny pushes him down the waterfall. Before they are going to kill him, Pizza Steve sacrifices himself to save Uncle Grandpa by being eaten by Martin, which made the pizza delicious that he never eaten.

Uncle Grandpa confronts Martin for hurting his friends, and he and Angry Grandpa fighting each other. As Angry Grandpa is about to fight Uncle Grandpa to death, Martin is turned into a stone by Mr. Gus, who using a wand, and is then sucked into the black hole, along with his henchmen.

Personality
Marty is a cunning, greedy, and comedic villain, and Lenny is less composed, more greedy, and cynical in nature and believes most things are lame. They are enjoying his disapproval of various cute things, usually exclaiming how Angry Grandpa feels.