From the video's caption: When things look their darkest, even heroes need a helping hand.
Debuted at Sonic's 25th Anniversary Party, take a first look at the newest entry in Sonic's journey!
Also below for SEGA fans is a Sonic Mania PS4 teaser trailer... it's coming in Spring of 2017 and enjoy all!
To quote: Sonic Mania brings fans back into the 2D world of platform games with nostalgic pixel-style art and core classic gameplay by reimagining iconic Zones and Acts from Sonic The Hedgehog, Sonic The Hedgehog 2, Sonic CD and Sonic The Hedgehog 3 and Knuckles.
Before you get too lost in nostalgia of the 1990s, the game is also adding in completely new Zones with all-new Acts and bosses into the mix.