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If Leonard Hoffstadter (Johnny Galecki) and Sheldon Cooper (Jim Parsons) were real people, Leonard probably would have killed Sheldon by now. He's incredibly annoying.

And in tonight's episode of "The Big Bang Theory" (7 p.m., CBS/Ch. 2), Leonard has had enough of Sheldon. A small argument between the two blows up into a major battle — and the rest of the gang is forced to choose sides.

Elsewhere on TV ...

• BYU commencement (4 p.m., BYUtv): Live from Provo

• "Grey's Anatomy" (7 and 8 p.m., ABC/Ch. 4): The doctors try desperate to save a young boy who's been shot; Callie and Sophia disagree about Sophia.

• "Strong" (7 p.m., NBC/Ch. 5): The remaining teams compete in a challenge that could send one pair to the Elimination Tower for a second time.

• "Bones" (7 p.m., Fox/Ch. 13): A body found in a car crash is identified as a leader of an organization that promotes men's rights.

• "D.C.'s Legends of Tomorrow" (7 p.m., CW/Ch. 30): A deadly assassin wants to erase the Legends from the time line by killing their younger selves.

• "Project Runway: All-Stars" (7, 8 and 9 p.m., Lifetime): Contemporary art inspires the creation of avant-garde fashions.

• "The Odd Couple" (7:30 p.m., CBS/Ch. 2): Oscar begins dating a young nanny who works for his neighbor.

• "Mom" (8 p.m., CBS/Ch. 2): Jodi's boyfriend arrives at an A.A. meeting and Christy struggles to show him compassion.

• "Scandal" (8 p.m., ABC/Ch. 4): Olivia uncovers the details about Jake and Rowan's plot; in fashbacks, Jake's origins with B6-13 are revealed.

• "The Blacklist" (8 p.m., NBC/Ch. 5): Red helps an enigmatic beauty who's on the run from unknown attackers.

• "American Grit" (8 p.m., CW/Ch. 13): TThe losing teams must send one team member to compete in "The Circus."

• "The 100" (8 p.m., CW/Ch. 30): Jaha returns to Polis; Octavia uncovers a clue.

• "2 Broke Girls" (8:30 p.m., CBS/Ch. 2): Max's boyfriend asks to spend the night at her apartment; Caroline trie to get a liquor license for their dessert bar.

• "Rush Hour" (9 p.m., CBS/Ch. 2): Carter and Lee investigate when two people with no obvious connection receive similar notes and are then killed by bombs.

• "The Catch" (9 p.m., ABC/Ch. 4): A client is being blackmailed; Margot and Ben are forced to pull a jewelry heist to pay their anxious benefactor.

• "Game of Silence" (9 p.m., NBC/Ch. 5): Gil goes rogue during a surprise visit with a former guard.

• "Orphan Black" (11 p.m., BBC America): Sarah tracks down an elusive new ally.

• "Inside Amy Schumer" (11 p.m., Comedy Central): Amy avoids having sex with her boyfriend; auditions for Lin-Manuel Miranda; and loses an eye.

• "Vikings" (11 p.m., History): Victory proves costly in the battle between the Vikings and the French. (Season finale)

• "The Real World: Go Big Or Go Home" (11 p.m., MTV): A new mission has major consequences for a roommate; Chris makes an emotional trip.

• "Lip Sync Battle" (11 p.m., Spike): Clark Gregg and Hayley Atwell face off.