Spleenk is a member of the Resisty. His species' homeworld has presumably been conquered by the Irken Empire. He has four arms, two fingers on each hand, and has a large purplish-grey spot on his forehead. It is unknown if all members of his species have this spot. He makes his debut in Backseat Drivers From Beyond the Stars. He is voiced by Rodger Bumpass.

Spleenk is full of horrible ideas, and is possibly third in command. Lard Nar usually listens to his ideas, and ends up regretting it. Spleenk is the one who came up with the name, the "Resisty". He also decided to attack the Massive, which almost gets them killed. He, like Shloonktapooxis, another Resisty member (and possibly second in command), is extremely stupid. He apparently has a seizure when he realises that the Resisty's ship is going to collide with planet Earth. Spleenk is one of the few Resisty members whose name is known.