This week's episode of "Arrow" revealed that after being framed by his commanding officer, John Diggle was incarcerated for treason. Lyla visited him in prison -- encouraging him that she could get him out -- but his guilt over killing Andy caused him to tell her to leave him alone.

Lyla isn't one to give up so easily and will be calling in the help of a certain green-hooded friend in next week's episode, "Penance," and the first promo for the episode -- airing Oct. 26 -- is now online.

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ARROW “Penance” — (8:00-9:00 p.m. ET) (TV-14, LV) (HDTV) 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 (#504). Original airdate 10/26/2016.

Airing Wednesdays at 8 pm ET/PT on The CW, “Arrow” stars Stephen Amell, Emily Bett Rickards, David Ramsey, John Barrowman, Willa Holland and more.