Being the smallest pirate in John Silver's crew, his alien appearance consists simply of a human head with dreadlocks (which are actually his arms and legs), which is why he is constantly perched on top of the head of his comrade Moron (an alien who resembles a human torso; it is most likely that the two pirates are brothers). Both Oxy and Moron are one of the only few pirates to survive during their mutiny, as they are arrested by Captain Amelia and Dr. Delbert Doppler for their crimes and mutiny alongside the remaining crew.
Oxy (left) and Moron (right)
Scroop, Krailoni, Hedley and Torrance angry
Oxy and Moron sleeping
Crew about to hurt Jim
Crew can't belive what they see
Hedley's defeat along with the other surviving pirates
Hedley alongside the remaining crew cheering for Jim for saving them from the exploding planet