MechaSoul | Sonic the Hedgehog Joins the Brawl! @MechaSoul | Uploaded October 2007 | Updated October 2024, 9 hours ago.
Sonic's "trailer", uploaded to the Dojo for the Oct. 10th update.

Disclaimer: I do not own Super Smash Bros or anything seen in this video. All rights go to their respective owners, whether it's HAL, Nintendo, Masahiro Sakurai, or anyone else. No copyright infringement is intended.