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.
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Trivia
He resembles Scroop from Disney's Treasure Planet and Sebulba from Star Wars.
All three characters act as rivals toward one of the protagonists.