 Valerian made his game debut in "Wings of Liberty".He is confronted by Jim Raynor, mistaking him for his father Arcturus, aboard the Dominion battlecruiser "Bucephalus".Valerian reveals that he is the owner of the Moebius Foundation, the think tank that Raynor had been collecting the pieces of a Xel'Naga artifact for, and claimed that his mission was the same as Raynor's – to rescue Kerrigan.