1) “Crazy Ex-Girlfriend” finale and concert, 8 and 9 p.m., CW. From its first moments, “Crazy” has been extraordinary. Each hour of a moderately clever comedy-drama is spiced by two or three music numbers; they work because the lyrics are brilliant and the cast has Broadway-type talent. Now the series concludes with Rebecca choosing a guy – Josh or Nathaniel or Greg or maybe no one. Then the cast combines for a concert, backed by band, orchestra and flashy videos.
2) “MacGyver,” 8 p.m., CBS. Three decades ago, Michael Des Barres – the former rock star with Power Station – played arch-villain Murdoc in the original “MacGyver” series; he would repeat the role six times over the next few years. This reboot has a new Murdoc, but it now has Des Barres as his mentor, Nicholas Helman. Tonight, he’s on a killing spree; Mac reluctantly turns to Murdoc for help.
3) “Hawaii Five-0” and “Blue Bloods,” 9 and 10 p.m., CBS. After a two-week basketball break, CBS’ Friday adventures are back. “Five-0” follows the history of one gun and its impact. Then “Blue Blood” has Danny pondering a cold case … then hesitating, when he learns who was the original detective.
4) “The Blacklist,” 9 p.m., NBC. Wall Street didn’t invent hostile takeovers, you know. Tonight, the team pursues a woman who does that in criminal organizations.
5) “Our Planet,” any time, Netflix. Propelled by new technology and sharp storytellers, we’re in a golden age for nature films. National Geographic’s six-week “Hostile Planet” debuted Monday, with a splendid episode that reruns at 9 p.m. today … the same day Netflix offers this eight-week series. Also streaming: “The Tick” launches its season today on Amazon Prime; the “Twilight Zone” reboot debuted Monday on CBS All Access with two episodes and will add new ones each Monday.