What’s On Tonight: Ra’s al Ghul’s Final Plan Threatens Starling On ‘Arrow’

 (The CW, 9:00 p.m.)
— Everyone’s at risk in the Season 3 finale, as Ra’s al Ghul’s final plan is realized and Oliver/Al Sah-him has to decide if he’s ready to fulfill his new role in “My Name Is Oliver Queen.”

Modern Family (ABC, 9:00 p.m.) — The Dunphys try to convince Alex to participate in Senior Skip Day while Manny goes full “David After Dentist” when he gets his wisdom teeth out.

NHL Playoffs (NBCSN, 7:30 p.m.) — This is the moment hockey fans have been waiting for. Rangers vs. Capitals. Game 7. Winner earns a trip to the Eastern Conference Finals. Loser goes golfing, presumably.

NBA Playoffs (TNT, 8:00/10:30 p.m.) — Steph Curry. Steph Curry. Steph Curry. Steph Curry. Steph Curry. Steph Curry. Steph Curry. Steph Curry. Steph Curry. Steph Curry. Steph Curry. Steph Curry. Also, Wizards at Hawks beforehand if that’s your thing.

The Goldbergs (ABC, 8:30 p.m.) — In the second season finale, the Goldbergs feel all the feels when Erica gets accepted into a summer arts program and prepares to spend 10 weeks away. Meanwhile, Barry learns the hard way that mascots will forever live at the bottom of the school sports totem pole.

CSI: Cyber (CBS, 9:00/10:00 p.m.) — Your prayers have been answered as CBS will air back-to-back new episodes of the Millennial-est version of their CSI programming. First, a hacker uses a power outage to mask a jewelry heist/homicide. That episode will be followed by the season finale, but we know they had you at “jewelry heist/homicide.”

Supernatural (The CW, 9:00 p.m.) — In the penultimate episode of Season 10, Dean goes HAM to avenge a friends death, and Sam struggles to come to grips with his decision.

Law & Order: SVU (NBC, 9:00 p.m.) — Sgt. Benson is officially asked to take the Lieutenant’s exam while her squad works to rescue a little boy who has been kidnapped for ransom. Also, Ice T gets in some perp’s face, probably.

Big Time in Hollywood, FL (Comedy Central, 10:30 p.m.) — Some monkey business goes nuclear in the opening scenes of the Dolphe brothers’ new movie as Cuba Gooding, Jr. raids a terrorist compound.

LATE NIGHT GUESTS: Rob Lowe, Jay Baruchel and Alingon Mitra Conan; James Marsden, Kat Graham and Brandon Flowers on Corden; Rebel Wilson, Rosie Huntington-Whiteley and Faith No More on Fallon; Elizabeth Banks, Marc Maron and Earl Sweatshirt on Kimmel; Julia Roberts, Paul Shaffer and Ryan Adams say goodbye to Letterman.