Special Guest Stars Neal McDonough as Damien Darhk Wentworth Miller as Len Snart / Captain Cold John Barrowman as Malcolm Merlyn Guest Stars Cole Vigue as Eliot Ness Isaac Keoughan as Al Capone Co Starring Cameron Dent as Bartender Sean Campbell as Agent Cole Bennett Dan Rizzuto as Goon Darryl Scheelar as Driver Donal Thoms-Cappello as Police Officer