Treehouse Masters (10 p.m., Animal Planet) – Sir Pete and the knights of the treehouse embark on a quest to Waxhaw, N.C., to build a jolly good English cottage in the trees for Gwen and Alan, a couple who lives on idyllic Storybook Farm. The couple’s livestock restricts them from getting away for vacations, so it’s up to Pete to build them a stay-cation destination right in their own backyard. To give the new treehouse – equipped with a hanging bed fit for a queen; a kitchen; a generous outdoor deck; and a lofted play zone for kids – an old English feel, Pete and his merry band of treehousers add dovecotes, creating a safe habitat for area birds.
Also on tonight . . .
Reign (8 p.m., CW) – As she works to form political alliances, Mary tries to resist falling for Gideon.
MasterChef Junior (8 p.m., Fox) – The four remaining cooks participate in a soufflé challenge.
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Blue Bloods (10 p.m., CBS) – A respected and recently retired NYPD lieutenant is accused of shooting potential muggers on the subway.
Killing Fields (10 p.m., Discovery) – The detectives find the last people who perhaps have seen Eugenie alive.