Grewnge is an antagonist in Treasure Planet. He is a large, fat gray reptilian alien with a pair of horns (one of which a gold ring hangs from) and a pair of antennae protruding from his head, and he sprouts a tail that is as thick as his fat legs. As one of the pirates in John Silver's crew, Grewnge seems to be the cannons expert, which is demonstrated when he fires with great accuracy at several incoming astroids during the meteor shower as well as the longboat Jim Hawkins, Captain Amelia and Dr. Delbert Doppler were escaping in during the pirates' siege on the Legacy. He is also provoked easily to any insult regarding his weight, as he rears in to kill Doppler for doing so, but this distraction leads to his arrest alongside the remaining crew.
"Yeah, baby. Ba-boom!"
"We are wanting to move."
Silver and crew about to get in
Grewnge about to fire
Turnbuckle, Crex, Mertock, Grewnge and blinko sleeping with Silver
Turnbuckle and Grewnge get Jim
Yelling after being bitten by Morph
Turnbuckle and Grewnge with Jim
Jim gets the map
The Map is opend
"I pummel you good!"
Dr. Doppler gets the upper hand
Dr. Doppler gets the upper hand 2
Grewnge's defeat along with the other surviving pirates
Grewenge alongside the remaining crew cheering for Jim for saving them from the exploding planet