Felicity takes on Damien Darhk while Oliver attempts to save Thea in ‘Lost in the Flood’

The battle against Damien Darhk is growing more and more intense as Arrow Season Four winds down, and The CW has now released the first details on one of the season’s final episodes.

Related: New Synopsis Finds Diggle on the Rampage

Airing on Wednesday, May 18, 4×22 – “Lost in the Flood” will continue the story thread that begins in this week’s “Genesis.” Here’s the newly released synopsis:

OLIVER FIGHTS FOR THEA; DONNA SMOAK FACES OFF WITH NOAH KUTTLER – Following the shocking events in the previous episode, Oliver (Stephen Amell) and Diggle (David Ramsey) race to rescue Thea (Willa Holland), while Felicity (Emily Bett Rickards), Curtis (Echo Kellum) and Noah (guest star Tom Amandes) join together to stop Darhk (guest star Neal McDonough). Glen Winter directed the episode written by Brian Ford Sullivan & Oscar Balderrama.

This week we’ll see Diggle reunited with his brother Andy, but not in the way he expects, while Thea and Alex have a disastrous vacation. Then in next week’s 4×21 – “Monument Point,” Felicity will seek help from her father Noah, who has a haunting talk with Oliver.

Related: The Calculator Returns in ‘Monument Point’

'Arrow' Actor Auditions for Lead Role in DCEU's 'Shazam!'

We’ll have all the details on Arrow‘s final Season Four episodes as they’re announced, so be sure to follow us on Twitter, Tumblr, and Facebook for all the latest!