The Underground Movement were a rebel group based out of the Odour Zone. They were composed of skunks of various sizes, all of whom spoke in stereotypical French accents. Their leader was the gigantic Marcel Skunk; the reasons for his giant size were never explained. Sonic the Hedgehog was familiar with their reputation.
For reasons unknown, Doctor Robotnik didn't dare to attack the Movement. However, when Marcel attacked one of Robotnik's labs, Robotnik had him turned into a giant Badnik and unleashed him on the Odour Zone. Sonic freed him.
The Movement did not appear in any other stories, and what they're up to these days is unknown. However, they have been mentioned in the Breaking News ticker.
| Current Members: Tails - Amy Rose - Tekno the Canary - Cedric the Elephant - Big the Cat - Chrysalis - Kintobor Computer
Other Groups: The Ultimax - The Flock - Turquoise Hill Freedom Fighters - Underground Movement - Sky Pirates - Household Keepers - Chaotix Crew - Scrap Mobians - Dolphin Resort Freedom Fighters - Bounder Brigade
- Underground Movement at Sonic News Network, the Sonic Wiki