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In the 10th-season finale of "The Big Bang Theory" (7 p.m., CBS/Ch. 2), Sheldon is trying to adjust while Amy is on the other side of the country — working at Princeton — for a few months.

Enter Dr. Ramona Nowitszki, last seen way back in Season 2, when she was a grad student who had a crush on Sheldon. Well, she's got a doctorate now, but it sure seems like Ramona still has a crush on Sheldon.

This is a very funny episode. "The Big Bang Theory" has already been renewed for two more seasons, and the fact that Episode 231 is this good makes me really glad.

And … I don't want to give anything away ... but let me just tell you — make sure you watch the whole episode. Don't miss the end.

Elsewhere on TV …

• College baseball (6 p.m., BYUtv): Portland at BYU

• "Grey's Anatomy" (7 p.m., ABC/Ch. 4): The doctors tackle a difficult case involving a dangerous patient; Owen receives life-changing news; Alex makes a shocking discovery.

• "Masterchef Junior" (7 p.m., Fox/Ch. 13): The remaining contestants cook for food critics, chefs and journalists at a pop-up restaurant on the California coast.

• "Supernatural" (7 p.m., CW/Ch. 30): Sam and Dean learn hunters are dying in suspicious accidents all over the country.

• College softball (7 p.m., P12N): Washington at Utah

• "American Race" (7 and 8 p.m., TNT): Charles Barkley begins his journey across America to discuss race in Baltimore, then heads to Texas.

• "Mom" (8 p.m., CBS/Ch. 2): Bonnie gets into trouble with the IRS. (Season finale)

• "Scandal" (8 p.m., ABC/Ch. 4): Jake learns the motivation behind Peus and her reign of terror. (Oh, and TVLine is reporting that the upcoming seventh season of "Scandal" will be its last. Thank goodness.)

• "Chicago Med" (8 p.m., NBC/Ch. 5): An audacious new doctor arrives at the hospital; Robin is admitted back into the hospital. (Season finale)

• "Riverdale" (8 p.m., CW/Ch. 30): The identity of the murderer is revealed. (Season finale)

• "Lip Sync Battle" (8 p.m., Spike): Bellamy Young vs. Matt McGorry

• "Life In Pieces" (8:30 p.m., CBS/Ch. 2): Colleen and Matt miss their flight to Mexico; Joan and John's dog swallows the wedding ring;. (Season finale)

• "The Amazing Race" (9 p.m., CBS/Ch. 2): Yet another U-turn causes still more friction among the teams.

• "The Catch" (9 p.m., ABC/Ch. 4): Alice and Ben have to face their pasts; a betrayal could change everything. (Season finale)

• "The Blacklist" (9 p.m., NBC/Ch. 5): A mercenary known as the Debt Collector goes after Liz.