The U.S.S. Cerritos encounters a familiar enemy. Tendi helps a struggling recruit find her footing.

Sam and Dean discover a wood nymph living in the bunker who is determined to protect her family, at any cost.

Jimmy faces off with H.E.R. in an intense guitar solo battle, chats with Eddie Redmayne and Guy Raz and welcomes musical guests Lele Pons and Guaynaa.