8 p.m., CBSJason Segel) gives Ted (Josh Radnor) and Robin (Cobie Smulders) a "Slap Bet" slap to use on Barney (Neil Patrick Harris). Plus, Chris Eliott guest-stars as Lily's (Alyson Hannigan) father.
8 p.m., NBCJack Coleman) hosts Thanksgiving dinner, but a mystery guest spooks the Petrellis.
Series finale, 9 p.m., TLC
Series premiere, 9:30 p.m., ABC
Also on the airwaves ...
Dancing with the Stars, 8 p.m., ABC
House, 8 p.m., FOX
Accidentally on Purpose, 8:30 p.m., CBS
Two and a Half Men, 9 p.m., CBS
Lie to Me, 9 p.m., FOX
Trauma, 9 p.m., NBC
The Big Bang Theory, 9:30 p.m., CBS
Castle, 10 p.m., ABC
CSI: Miami, 10 p.m., CBS
Million Dollar Listing, 10 p.m., BRAVO
Cake Boss, 10 p.m., TLC
Chef Academy, 11 p.m., BRAVO
What are you watching tonight?