"Dora and Friends: Into the City" (8 p.m., Nickelodeon): This spinoff of the popular children's show follows Dora, now 10 years old, and a group of new pals as they embark on adventures in a pan-Latino metropolis by the sea.
"Dallas" (9 p.m., TNT): The last time we saw the show, Southfork was ablaze. The sizzling drama returns tonight and the Ewings naturally are demanding answers about the fire that put their family ranch in peril.
"American Ninja Warrior" (9 p.m., NBC): The finalists compete in Las Vegas, where they take on Stage 1 of a four-stage course modeled after a Japanese mountain. Expect a lot of eyes to be on the phenomenal Kacy Cantanzaro, the first woman to make it this far in the competition.
Also on Monday: