Underground The road to freedom lies ahead in the season finale of the Civil War-era historical drama. 7, 8, 9 and 10 p.m. WGN America
Arrow Back in his mayoral seat, Oliver (Stephen Amell) deals with a major threat to the city with the release of dangerous criminals, who had been sent to prison by prosecutor Adrian Chase (Josh Segarra). 8 p.m. KTLA
The Goldbergs Worried about how they’ll look in their school yearbook, Barry and Erica (Troy Gentile, Hayley Orrantia) ask Adam (Sean Giambrone) for a preview. 8 p.m. ABC
Nature The conclusion of “Dolphins: Spy in the Pod” continues the...