The Gooey Aliens are green mollusk-like aliens that plans to dominate Earth (though it is unknown this is the first they have invaded or how many they taken).

They take control of Dexter's family including Dee Dee as hosts to use his lab and build a transceiver to contact their own species in outer space.

They get beat up by the Dextransformer (Dexter's dodgeball battlesuit) which expels them from their 3 human hosts and stopped their potential invasion of Earth. They try to escape but get squashed by Dexter and die.