|Voiced by||Peter Cullen|
Marcus Phantomus was hired by Prime Evil to steal Golden Wreath in ancient Rome before it became an heirloom for Madame Why in the present. Phantomus had the fasted chariot in the ancient world, pulled by robot horses.
At Circus Maximus, Phantomus competed with his chariot against the Ghostbusters and Tanya the fortune teller in her gypsy wagon which had been converted by Tracy the Gorilla. His chariot was even equiped with a zap-ray in the back. But when Tracy used a large pizza plate to deflect one of Phantomus' blasts, his robot horses were zapped and he was out of the race.
Marcus Phantomus first appeared in the episode Ghostbunglers.