Next to finding out how Agent Coulson (Clark Gregg) survived, fans of Agents of S.H.I.E.L.D.'s consummate company man have been desperate to learn more about the mysterious cellist, a person he was dating whom was briefly mentioned at the time of his death in The Avengers. The entire Whedonverse shares that sentiment for Acker, who is best known for playing Fred on Angel, had a recurring role on Dollhouse, and recently shared the screen with Gregg in S.H.I.E.L.D.