Chuck (8:00 p.m. EST, NBC)

Your favorite geeky spy is in action. On tonight’s episode, the spies discover that a malevolent operative was the one responsible for Shaw’s (Brandon Routh) wife’s death. They do their best to find the murderer, but Chuck (Zachary Levi) is worried about Shaw’s mental state about the whole thing. Meanwhile, Morgan (Joshua Gomez) ponders upon leaving Buy More.

Little People, Big World (8:00 p.m. EST, TLC)

Jeremy and Zach go on a European trip together, which is sure to be both fun and stressful. The brothers start in Scotland, where they quickly find that traveling without the rest of the family is harder than they thought it would be. Another new episode follows this one, at 8:30 p.m.

EST, where the boys check out Amsterdam’s notorious red-light district. While this would normally be the highlight of the trip for any other male, these two brothers end up arguing. Silly boys.

Castle (10:00 p.m. EST, NBC)

When a museum curator dies, Castle (Nathan Fillion) and Beckett (Stana Katic) are led to a mummy’s curse. After peeking at some “forbidden” artifacts, Castle worries that he, too, will fall victim to the ancient curse. Us writers sure do have big imaginations, don’t we? Or…is the curse authentic?