He is protrayed as "mad" and often creates inventions that usually end humiliatingly for Vexus's team.
Krackus is a crackpot inventor of the Cluster and generally seen as a joke, even by his own race, as his creations are known for falling apart.
His first appearance was in "Around the World in Eighty Pieces". Krackus appears to be rather absent-minded, as he continues to forget Jenny's name. However, he actually manages to do something productive for the Cluster — using his latest invention, the “disassembler”, to cause Jenny to literally fall to pieces and scatter her pieces all over the Earth. Only her head and hands were rescued from the scattering by Brad, Tuck, and Sheldon. Krackus planned on hailing Vexus immediately to summon an invasion on Earth, but his communicator fell apart as he tried to call her. Jenny and her friends managed to gather up all her pieces before Krackus fixed his communicator. Unfortunately, they fail to recover Jenny’s belly-bolt lynchpin, which is the critical part that holds her together. Despite this, she and her friends manage to fool Vexus and Krackus with some clever thinking, “reconstructing” Jenny with support from a tree branch to make it look as if she is perfectly intact. Upon seeing Jenny, apparently still intact, Vexus angrily pulls Krackus back to Cluster Prime before either could become the wiser.
In "Toying With Jenny", Krackus teamed up with Vexus, and they disguised themselves as toy maker “Mr. G. Petto” in order to trick Jenny into making a line of “Action Jenny Dolls”, action figure toy versions of her, which were programmed to come to life and take over Earth once purchased and activated by the children who were fans of her. Jenny tries to defeat the army of hostile toys, but is nearly destroyed due to being completely outnumbered. However, Brad and Tuck find the master power switch (Krackus’ idea) which shuts all the toys down at once, thwarting Krackus’ and Vexus’ scheme (even though he was told by Vexus not to add any master power switch to any of his inventions).
In "Escape from Cluster Prime", Krackus was sent to unleash nanobots he invented to torment the citizens of Tremorton. However, the citizens find ways to defeat them using water guns. Later, he was onboard Smytus' ship when Smytus self-destructed it, but he too survived somehow.
He appeared again in "Trash Talk", where he took part in Vexus and Smytus' scheme to drain Jenny's energy on a garbage asteroid.
- Krackus’ name is likely derived from the word “crackpot”, meaning “an eccentric, impractical, foolish person”, which decribes Krackus perfectly as the mad and eccentric inventor of the Cluster whose impractical inventions nearly always malfunction.
- As a running gag, every mechanical object around him, be it his own or not, malfunctions and crumble to pieces, and he often pronounces Jenny's name wrong.