Thursday television

"The Big Bang Theory" 8 p.m. CBS — When Sheldon's accidental scientific discovery is disproved, Amy and Leonard try to comfort him.

"The Sound of Music Live" 8 p.m. NBC — Carrie Underwood plays Julie Andrews' role in this live version.

"Glee" 9 p.m. Fox — The Glee kids audition for roles in a living Nativity scene.

"Grey's Anatomy" 9 p.m. ABC — April's sister visits and begins to annoy her.

"White Collar" 9 p.m. USA — Neal becomes immersed in the mysteries of the Codex.

"Scandal" 10 p.m. ABC — Team loyalties are tested as Liv's crew uncovers the truth.