The CW has released the synopses for episode 22 and 23
Episode 22
"Who We Are" - (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

FAMILY - Caught in a dangerous situation, Sam (Jared Padalecki) and Dean (Jensen Ackles) only have each other to rely on. Meanwhile, the fight between the American Hunters and the British Hunters comes to a head. John Showalter directed the episode written by Robert Berens (#1222). Original airdate 5/18/2017.
Episode 23
"All Along the Watchtower" - (9:00-10:00 p.m. ET) (Content Rating TBD) (HDTV)

EPIC SEASON FINALE - Lucifer (Mark Pellegrino) battles Sam (Jared Padalecki), Dean (Jensen Ackles) and Castiel (Misha Collins) for control of his unborn child. Robert Singer directed the episode written by Andrew Dabb (#1223). Original airdate 5/18/2017.
The last two of the season. It looks like we wrap up the BMOL saga in episode 22. How does the fight against the BMOL come to a head? What dangerous situation are Sam and Dean caught in and why do they only have themselves to rely on?
The finale is looking to move the nephilim story forward. Lucifer has escaped Crowley and is fighting to control his child. He was so sure it would be a boy this week, so I will laugh and laugh if he turns out to be a she! Who will win the battle for the nephilim? Is it possible that the nephilim could be stronger than Lucifer? Let us know in the comments or in the discussion threads for episodes 22 and 23.