SPOILER ALERT: This story contains details of tonight's Agents of S.H.I.E.L.D. Agents of S.H.I.E.L.D. ended its Season 4 LMD pod with a shocker that no one saw coming. After perishing in the Season 3 finale, it looks like a certain specialist, who was secretly a HYDRA agent, will be returning to the series. “Self Control," the episode directed and written by Jed Whedon, saw the team compromised and replaced with Life Model Decoy versions of themselves.