Commander Smytus made his first appearance in "Dressed to Kill" where an accident on his ship caused him to lose a case of super-powered Pip-Crystals; the crystals landed on Earth, especially on the dresses Brit and Tiff Krust were examining for the upcoming prom. With the Krust cousins in control of the crystals, Smytus quickly lost and was shrunk to the size of a beetle (it is unknown how he later returned to normal). The fight over the Pip-Crystals ended with Jenny cleverly showed the Krust cousins an article deeming crystals out of style, and the crystal-covered gowns were locked away. Later, Smytus managed to catch Jenny in a trap and then assimilate her into the Cluster, an act that sent out a distress signal which automatically reactivated prototypes XJ-1 through -8. Smytus managed to assimilate the second through eighth prototype XJ robot before XJ-1 inadvertently brought Jenny back to her senses by throwing motor oil up on her face.
In "Escape from Cluster Prime", when Vexus launched her invasion on the Earth, Smytus was put in charge of enslaving everybody on Earth and putting them to work building more robots for their army. When Brad and Tuck rounded up a mini coup to force the Cluster to leave, Smytus set to detonate Earth instead. Once Jenny had left Cluster Prime free of Vexus and with their golden computer chips returned, she came back to save Earth from being blown up. In a last resort, however, Smytus set himself to self destruct, but Jenny evacuated his ship of all her friend and allies, and then she tossed Smytus' ship deep into space where the resulting explosion wouldn't harm her home world. Smytus somehow survived his own detonation and appeared again, along with Vexus and Krackus, on a garbage asteroid. When Jenny happened upon that asteroid in "Trash Talk", Vexus planned to drain her of her energy, but the three got into an argument over how to use it.