TV higlights: ‘David Cassidy: The Last Session’ special on A&E

(All times Eastern.)

The Bachelorette (ABC at 8) Becca takes six of the men on a spa date.

So You Think You Can Dance (Fox at 8) Auditions continue in Los Angeles.

Supergirl (CW at 8) Supergirl, Mon-El and Alura devise a plan to stop Serena.

Dietland (AMC at 9) Plum goes through withdrawal while tackling a new assignment.

Who Do You Think You Are? (TLC at 10) Molly Shannon, of SNL fame, examines her family history.

The Price of Duty (Oxygen at 8) Homicide detectives share stories from the cases that haunted them the most throughout their careers.

Disney’s Fairy Tale Weddings (Freeform at 8) A look at magical weddings that occur at Disney destinations.

Drinks, Crime and Prohibition (Smithsonian at 8) The history of how the Prohibition era unfolded.

Conan (TBS at 11) Amanda Peet, Daniel Cormier, Steve Cropper Benjamin Booker.

Daily Show (Comedy Central at 11) Sen. Kirsten Gillibrand (D-N.Y.), Col. Don Christensen, BriGette McCoy.

Fallon (NBC at 11:34) Jim Parsons, Marlon Wayans, Smashing Pumpkins.

Colbert (CBS at 11:35) Chris Matthews,

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