|This character exists primarily or exclusively within the Sonic Underground continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Marty is an anthropomorphic penguin about Sonia's height. Slightly chubby in appearance, he has black and white feathers, dark blue bushy eyebrows, black eyes, a medium-long orange beak and orange web feet. For attire, he hears a red stocking cap with a white rim and puff ball, a red jacket, a light green scarf, yellow mittens and light green ear warmers.
A devout follower of Queen Sauna, Marty, along with Moe and Jeff, would encounter Sonia the Hedgehog underneath their native icecap. Believing Sonia was Queen Sauna, who was prophesized to one day return to their kingdom and bring about an era of warmth and happiness, Marty and his crew brought Sonia to their village. When their home began melting however, Marty realized Sonia was not Sauna. Regardless, he, Moe and Jeff still joined up with her and helped the Sonic Underground foil Dr. Robotnik's plans to melt the polar icecaps and flood Mobius.