Oliver and Lyla Go On a Mission For Diggle in Arrow's "Penance" Synopsis

The CW has released the official synopsis for "Penance," the fourth episode of Arrow's fifth season.

In the episode, Lyla Michaels and Oliver Queen have to take on a secret mission on behalf of John Diggle -- but that leaves Star City unprotected and a not-ready-for-primetime Team Arrow 2.0 in a bad position.

You can check the synopsis out below.

OLIVER STEPS IN FOR DIGGLE — Oliver (Stephen Amell) and Lyla (guest star Audrey Marie Anderson) team up on a secret mission for Diggle (David Ramsey). Felicity (Emily Bett Rickards) finds out and disapproves of the plan and opts to stay behind. When Tobias Church (guest star Chad L. Coleman) launches a deadly assault against the city, Felicity must decide if she wants to send the recruits out sans the Green Arrow.

Dermott Downs directed the episode written by Brian Ford Sullivan & Oscar Balderrama.

Arrow airs on Wednesday nights at 8 p.m. ET/PT on The CW. "Penance" will air on October 26.