Megan Boone

Thursday's TV highlights: 'MasterChef: Junior Edition' on Fox

Thursday's TV highlights: 'MasterChef: Junior Edition' on Fox

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The Big Bang Theory Leonard, Sheldon and Howard (Johnny Galecki, Jim Parsons, Simon Helberg) finish their project with the Air Force, but it doesn’t end as they had expected. Guest star Dean Norris (“Under the Dome”) returns. Kaley Cuoco, Mayim Bialik, Kunal Nayyar and Melissa Rauch also star. 8 p.m. CBS

Supernatural Occasional guest star Richard Speight Jr. directs this new episode in which a woman and her twin brother (guest stars Kara Royster and Kendrick Sampson) seek help in the search for their missing mother (guest star Alvina August). Jared Padalecki and Jensen Ackles star. 8 p.m. KTLA

Grey's...

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