Infinite (formerly known as the ultimate mercenary), is the secondary antagonist in Sonic Forces. He is an anthropomorphic jackal, and was formerly the leader of the Jackal Squad mercenary group. During a raid, Infinite was hired by Dr. Eggman to protect his facility, only for him and his squad to fall at the hands of Shadow the Hedgehog. Ashamed of his loss, Infinite decided to obtain the power of the Phantom Ruby as a means of not only becoming stronger, but to also abandon his "weak", past self.