A star of television, stage and country music who has sold more than 57 million albums, Reba McEntire goes looking for her roots on “Who Do You Think You Are?” (7 p.m., NBC)

A musical prodigy from Oklahoma, McEntire discovers that her ancestors were quite prominent citizens in North Carolina and that more distant relations were involved in some of the darker chapters of American history. She also learns to appreciate the sacrifices her people made to come to this country and begin their lives anew.

Reba’s series “Reba” ran for six seasons on the WB network and she was nominated for a Golden Globe. “Reba” was one of that now-defunct network’s most popular shows among viewers 18-49. McEntire has announced that she’s going to be working on a pilot for ABC called “Malibu Country.” Like “Reba,” it’s about a divorced mother. But this time she’s a music star trying to reboot her career.

• How do you go from changing the world to reality television? Back in the 1970s, Steve Wozniak founded Apple Computer along with Steve Jobs and Ronald Wayne. The rest, as they say, is history.

Wozniak has blazed an eccentric trail since creating the Apple I and Apple II computers. He’s appeared on “Kathy Griffin: My Life on the D-List” and even dated its star for a while. He hoofed it on “Dancing With the Stars” and played himself on an episode of “The Big Bang Theory.” (Leonard considers him a cult hero for his work at Apple, while Penny knows him as a contestant on “Dancing With the Stars.”)

Tonight, Wozniak adds to his small-screen credits with a stint on “Shark Tank” (7 p.m., ABC) as a consultant to an entrepreneur who needs an edge while negotiating with potential investors.

Tonight’s other highlights

• The head of a fast-food chicken chain gets lessons in worker motivation on “Undercover Boss” (7 p.m., CBS).

• Less than lucky loot on “Grimm” (8 p.m., NBC)

• A reporter and close friend of Frank’s is threatened with violence on “Blue Bloods” (9 p.m., CBS).

• Accidents on land and sea loom large on “Bering Sea Gold” (9 p.m., Discovery).

• An anti-Olympics movement gains traction on “Portlandia” (9 p.m., IFC).