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Sheldon and Howard think they're so smart, but they can't get a toy drone to work on this week's episode of "The Big Bang Theory" (7 p.m., CBS/Ch. 2).

Leonard has problems of his own. A canceled flight may keep him from delivering the commencement address at his high school.

And Raj has an even bigger problem when his rich father cuts him off financially.

Elsewhere on TV ...

"College baseball" (6 p.m., BYUtv): San Francisco at BYU

"Grey's Anatomy" (7 p.m., ABC/Ch. 4): Derek witnesses a horrible car accident and springs into action to save lives.

"Bones" (7 p.m., Fox/Ch. 13): A high-stakes gambler's remains are discovered in an industrial shredder.

"The Vampire Diaries" (7 p.m., CW/Ch. 30): Wrestling with whether or not to tell Elena about the cure, Damon brings up their future together and what life would be like if they weren't vampires.

"The Odd Couple" (7:30 p.m., CBS/Ch. 2): Oscar and Felix compete to see who's the better athlete.

"Scandal" (8 p.m., ABC/Ch. 4): The public turns against Mellie, and Cyrus comes to her defense.

"The Blacklist" (8 p.m., NBC/Ch. 5): Red fights for his life while the task force races to find a mysterious figure from his past.

"Backstrom" (8 p.m., Fox/Ch. 13): Valentine's abuser is found murdered on Backstrom's doorstep.

"Reign" (9 p.m., CW/Ch. 30): With the threat of England looming, Mary aligns herself with France and, thus, the ailing Francis.

"Mom" (8:30 p.m., CBS/Ch. 2): Christy and Bonnie's contentious relationship makes them unwelcome guests wherever they go.

"Elementary" (9 p.m., CBS/Ch. 2): When two New York City paramedics are killed during a kidnapping, Holmes and Watson join the manhunt to find the murderer and the woman he abducted.

"American Crime" (9 p.m., ABC/Ch. 4): As news of Aliyah's organized march for Carter's cause spreads, tensions and emotions within the community rise.

"The Comedians" (11 p.m., FX): Billy and Josh get high when they're supposed to be attending an awards show.

"Vikings" (11 p.m., History): The Vikings make another attempt to take Paris. (Season finale)

"Dig" (11 p.m., USA): Lynn suspects there's a mole at the consulate; Debbie returns to the compound seeking vengeance.

"Louie" (11:30 p.m., FX): Louie encounters an old acquaintance.