1) “Secrets of the Dead” season-opener, 10 p.m., PBS. At its peak, Rome’s Colosseum (shown here) held more than 60,000 people. At its moral depth, it had gladiators fighting, prisoners being executed, African animals being slain. Here’s a fascinating look at the structure itself.
2) “The Floor,” 8 p.m., Fox. The fourth “American Idol” winner, Carrie Underwood, has had 16 No. 1 country hits. Her runner-up, Bo Bice, has had (post-“Idol”) one single that was No. 56 on the pop chart. Now, 20 years after their season, Bice (who spent five years fronting Blood, Sweat & Tears) competes. It’s a fun hour that has host Rob Lowe watch a “brat pack” round.
3) “Chicago Med,” 8 p.m., NBC. It’s the 200th episode of this show, which has just started its 11th season. Today, one of the original stars returns. Nick Gehlfuss played Dr. Will Halstead for eight seasons, disappeared for two and now will have guest spots this year.
4) “Law & Order Toronto: Criminal Intent,” 8 p.m., CW. A prominent painter is killed. And yes, Detective Graff has expertise in art … and, it seems, in everything else. It’s a fairly good hour (but not as good as the first two), followed by an excellent “Wild Cards” rerun with an amnesiac engineer.
5) ALSO: ABC has “Shifting Gears” at 8 p.m. (a first date for Matt and Eve,
played by Tim Allen and Jenna Elfman) and “Abbott Elementary” at 8:30 (a new guidance counselor arrives). At 9, Fox has “99 to Beat,” accurately summed up by one contestant: “This is the stupidest, stupidest game.”
ALSO: The baseball playoffs have four games today. On Fox Sports1, it’s Mariners-Tigers at 3:08 p.m. ET and Bluejays-Yankees at 7:08. On TBS, it’s Brewers-Cubs at 5:08 and Phillies-Dodgers at 9:08. The Mariners, Bluejays, Brewers and Dodgers are each one game away from winning the best-of-five series.