Agent Carter: How to Dismantle an Atomic Bomb http://www.vulture.com/2016/02/agent-carter-recap-season-2-episode-5.html
The episode opens as Peggy is awakened by Jason Wilkes, who has discovered that a tissue sample from Jane Scott — the "lady in the lake" corpse from the premiere — allows him to turn him solid for a brief period. (It also turns the whites of his eyes black, for unknown reasons that are almost definitely bad.) Jason's brilliant science brain has led him to a similarly brilliant hypothesis: If he can get a hold of Jane's body, then he'll get more corporeal time. That's good enough for Peggy, who grabs Jarvis and rushes off to the facility where Jane's body is stored.