Recall is an Arbiter spell. It teleports any friendly units within its radius to the Arbiter's location, assuming it is over land. Recall works on all units the Protoss player controls, even Terran and Zerg units that have been Mind Controlled.
 Game Usage
 Protoss vs Terran
Recall is most often used in the late game against Terran. Because of the lack of mobility of the Terran mechanical army, Recall is used to avoid the Terran and attack their bases directly.