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Psi Squadron is an Interdiction squadron assigned to Wing II on the Imperial-II Class Star Destroyer Warrior. The squadron is currently inactive. Previously, Psi was one of three Wing II Squadrons to be reactivated during the "Reformation" along with Kappa Squadron and Rho Squadron aboard the SSSD Sovereign in 1999.
Much of Psi Squadron's history has been lost. The squadron was the subject of as least two custom missions for TIE Fighter in the Battle Center: TIE-free 121: Psi Squadron's Reunion by GN Sasquatch and TIE-free 151: The Patrol - Return of Psi Squadron by LT Thunder