In Item 47, which was released on The Avengers Blu-ray, the Lost alum played S.H.I.E.L.D. Agent John Blake, who is tasked with tracking down a couple who find a Chitauri gun, which they use to rob banks.
When floating bodies turn up in an upcoming episode of S.H.I.E.L.D., titled "FZZT," Coulson (Clark Gregg) and the S.H.I.E.L.D. team must hunt down an elusive killer. Blake will apparently help the team during the episode.
Blake will likely be shocked to find that Agent Coulson is alive. In Item 47, he and a fellow agent reminisce about Coulson following his death. Here's hoping Blake's arrival means Lizzy Caplan may appear, since her character, half of that couple, became his assistant in Item 47.
Agents of S.H.I.E.L.D. airs Tuesdays at 8/7c on ABC.