SERIES

It takes a while, but guest star Winona Ryder finally plants a big wet kiss on a startled Rachel (Jennifer Aniston) toward the end of “Friends” (8 p.m. NBC).

Catherine and Grissom search for human remains in the desert, while Warrick and Sara handle the case of a murdered stripper on “CSI: Crime Scene Investigations” (9 p.m. CBS).

Will and Jack discover that their once-wild buddies have become doting, domestic parents on “Will & Grace” (9 p.m. NBC).

SPECIALS

“Our Heritage Is at Stake: On the Campaign Trail With David Duke” follows the former Ku Klux Klan leader during his unsuccessful 1996 bid for the U.S. Senate. (10 p.m. KCET)