1) “Bachelor in Paradise” season-opener, 8-10 p.m., ABC. A week after “The Bachelorette” ended, five of the guys show up in this spin-off. Tre Cooper (shown here on “Bachelorette”), Aaron Clancy, Connor Brennan, James Bonsall and Karl Smith are among the 10 men at a Mexican resort, alongside 13 women. Hosting is Wells Adams, a bartender who was eighth in the 2016 “Bachelorette” and is engaged to Sarah Hyland of “Modern Family.” He’ll have various co-hosts, starting with David Spade.
2) “Celebrity Dating Game” season-finale, 10 p.m., ABC. Joey Lawrence has been on TV for three decades, since playing Mayim Bialik’s brother in “Blossom.” Lawrence, 45, looks for love, a year after filing for his second divorce. Also looking is Marcus Scribner, 21, who plays Andre Jr. in “Black-ish.”
3) “Bob (Hearts) Abishola,” 8:30 p.m., CBS. There’s one obstacle to a Bob/Abishola marriage: She never legally ended the Nigerian marriage to the man who left her. Now, visiting the U.S., he refuses to let her free; in some very funny scenes, Bob brings his own lawyer.
4) “The Republic of Sarah,” 9 p.m., CW. This notion of being a self-contained country can be tricky. Now a sudden burst of warm weather follows the recent blizzard; a flood is looming. Desperate, Sarah asks her estranged father for help. Also, Bella and Tyler take a big step in their relationship.
5) “The Beast Must Die” finale, midnight to 1:08 a.m., AMC; repeats at 4:08. The finale has been pushed back to late-night, where few people will see Cush Jumbo’s superb performance. She plays a teacher who went undercover to find the hit-and-run driver who killed her son. She found him, apparently, but someone else killed him first. Now a diligent cop tries to figure out who did it.