The Flash
CW, 8 ET/PT
Fans of DC's Legends of Tomorrow may want to rewatch this Flash/Arrow crossover that helped set up the show. It starts as Kendra is attacked by Vandal Savage in Flash’s Central City and ends with her in Arrow’s Star City, where she’s kidnapped by Hawkman. And if you’re not a fan, you can watch and try to figure out what exactly the more entertaining and soundly constructed Flash and Arrow are doing that Legends is not. Which is something, by the way, the folks at Legends are probably pondering themselves.
Containment
CW, 9 ET/PT
Legends, at least, will get a second season to work out its kinks. For Containment, tonight's finale is the end of the road. It would be nice to be able to promise fans who’ve stuck with the show that it will wrap up all the lingering plot points and questions in a cliffhanger-free ending. But based on the timing of the cancellation, that seems unlikely. So brace yourself for the possibility of an open-ended ending.
Zoo
CBS, 9 ET/PT
As Jamie arrives in Caraquet, her friends try to recover from their battle with an earthquake-causing sloth and its mole henchmen. Just contemplate those words for awhile, because the Zoo that takes place in your mind is reliably more entertaining than the CBS version.