Riverdale (CW at 8) Riverdale's mayor (recurring guest star Robin Givens) calls an emergency town-hall meeting to try to address the town's growing fears.
Empire (Fox at 8) Cookie tries to get Lucious back in the recording studio after the truth about his memory loss is exposed.
Law and Order: Special Victims Unit (NBC at 9) Rollins goes undercover at a high-end rehab center.
Modern Family (ABC at 9) Claire (over)enthusiastically plans a 10th anniversary party for Jay and Gloria.
Nova (WETA and MPT at 9) The docu-series explores the devastation behind the Great Hurricane of 1780, which killed at least 20,000 people.
Queen Sugar (OWN at 10) Violet tells Hollywood about her diagnosis.
Designated Survivor (ABC at 10) Kirkman works to thwart a national security threat.
Criminal Minds (CBS at 10) The BAU tries to figure out what a group of missing women have in common.
Frontline: Putin's Revenge (WETA and MPT at 10) This two-part documentary concludes with a look at Russian involvement in the 2016 election.
Total Divas (E! at 9) Season 7.
Full Frontal (TBS at 10:30) Samantha Bee returns.
Conan (TBS at 11) Kristen Bell, Frank Grillo, Beth Stelling.
Daily Show (Comedy Central at 11) Hillary Clinton.
Fallon (NBC at 11:34) Chris Hemsworth, Lindsey Vonn, Maroon 5, SZA.
Colbert (CBS at 11:35) Nicole Kidman, Jonathan Groff, Walter Isaacson.
Kimmel (ABC at 11:35) Guest host Channing Tatum. Ellen DeGeneres.
Corden (CBS at 12:37) Mila Kunis, Jim Parsons, Sam Smith.
Meyers (NBC at 12:37) Blake Shelton, Robin Thede.