He joins the previously announced Cian Barry, Arthur Darvill and Laurence Fox in the cast of Jonathan Lewis' play, under the direction of David Grindley.
It is produced by James Seabright, Jenny Topper, Sue Scott Davison and Lee Menzies.
The play tells the story of the tribulations, tedium and terror that young soldiers face when recovering from injuries incurred in the line of duty.
Lewis was recently on TV as Jamie in Kay Mellor's primetime BBC One hit series "The Syndicate." He recently completed filming on the forthcoming British heist movie "Wasteland," co-starring Timothy Spall. On stage he was last seen in the national tour of Agatha Christie's Verdict.
To book tickets, contact the box office on 0844 482 9672, or visit www.ourboystheplay.com for more details.