After a run-in with a rogue Woman of Letters, Castiel finds himself with visible wings. Being injured in the aftermath of the encounter and stuck on lockdown in the bunker is bad enough, but between attacking zombies, cultlike followers, and his tentative relationship with Dean, he soon finds that his injuries are the least of his worries.
Bucky's missing.
In his apartment, Sam finds his arm, his phone, his dog tags, and a really angry three-legged cat.