The synopsis for Supernatural season 15 episode 14.
 
“Last Holiday” — (8:00-9:00 p.m. ET) (TV-14, LV) (HDTV)

MAKING UP FOR LOST TIME - Sam (Jared Padalecki) and Dean (Jensen Ackles) discover a wood nymph (guest star Meagan Fey) living in the bunker who is determined to protect her family, at any cost. Eduardo Sanchez directed the episode written by Jeremy Adams (#1514).

Original airdate 3/30/2020.

Source:

CW

 
We have a wood nymph? That's a new MOTW. What do you think? Let us know in the comments or in the discussion thread for episode 14.