The Alliance is a group formed by ARIA to stop Gargos' invasion on Earth. The Alliance is composed of former contestants of the Killer Instinct tournament and of Ultratech agents, later recruiting other members.
- ARIA (founder and leader)
- TJ Combo
- Kim Wu (recruited by Jago)
- Hisako (recruited by Kim Wu)
- Tusk (recruited by Kim Wu)
- Kilgore (reactivated & reprogrammed by ARIA)
- The members of the Alliance comprises of almost every single fighter in Killer Instinct (2013), except for Sadira, the bonus characters Shadow Jago and Omen (for obvious reasons), the trio of guest fighters (Rash, Arbiter and General RAAM), Mira, Gargos (for obvious reasons), and Eyedol.
- While Eyedol shares the Alliance's goal to defeat Gargos and his Omens and Mimics, he isn't a member of the Alliance, acting on his own accord.