Sonic, Knuckles, and Tails reunite against a powerful new adversary, Shadow, a mysterious villain with powers unlike anything they have faced before. With their abilities outmatched, Team Sonic must seek out an unlikely alliance.
When Dr. Robotnik returns with a new partner, Knuckles, in search of an emerald that has the power to destroy civilizations, Sonic teams up with his own sidekick, Tails, on a journey across the world to find the emerald first.
It's 1947, and hard-boiled private investigator Charlie Nickels' client is murdered and her priceless diamond stolen. The investigation forces him to do the one thing he vowed never to do again: trust a dame.
