Harvax is a dark blue fly like alien who races against Sylvia and Wander with his partner, Stok, in the speedway Galactic Conjunction 6000 in the episode "The Time Bomb". Harvax and Stok both tease Sylvia about her nickname "The Time Bomb", due to the fact she rages when she gets competitive.
He is a dark blue fly alien with six legs. He wears a brown vest with spikes on the back. He wears goggles which show his eyes green with black slits. He wears a spiky belt around his waist with a chain attaching to Stok's trash can. He wears a brown biker hat. He wears a novelty mouth which is long and has large red lips with sharp teeth (one of them is gold). His real mouth is short with a floppy beak.