If Dungeons & Dragons can’t reunite father and son then, really, what can? After Professor Hickey announces that he’s a grandfather on “Community” (NBC at 8 p.m.), the gang uses the fantasy role-playing game to bring Hickey together with his son (played by David Cross) before it’s too late.

“Hell’s Kitchen” (Fox at 8) challenges the 19 remaining contestants to a tricycle relay race that hopefully has something to do with culinary skill, and with rewards that are always amusing, the winners receive a trip to San Francisco while the losers are forced to go carrot-picking.

Because Ann has left Pawnee to have a baby, Leslie is on the lookout for a new BFF and to find one as extraordinary as Ann, she hosts an impromptu Galentine’s Day on “Parks and Recreation” (NBC at 8:30).

Jennifer Lopez and pop-rockers Royal Teeth perform on the “American Idol” (Fox at 9) stage before one finalist is eliminated from the competition.

Meredith receives special help with her groundbreaking vein project on “Grey’s Anatomy” (ABC at 9), while Richard receives a birthday gift from Bailey in the form of a spot in the operating room during an extraordinary case.

The stories behind a pistol allegedly linked to Annie Oakley and haunted cement shoes are explored on “Mysteries at the Museum” (Travel at 9).

Miscommunication is causing all of the problems on “Parenthood” (NBC at 10), when Joel forgets to pick up Victor from baseball practice and Max gets in trouble after he fails to understand his classmates during a field trip.

Someone unexpected looks to Olivia’s team for help on “Scandal” (ABC at 10) and problems arise when Sally meets with the NRA.

FINALE WATCH: In the Season 2 finale of “Welcome to Myrtle Manor” (TLC at 10), Myrtle Manor and Village Creek go head-to-head in the Trailer Park Games.

“The Tonight Show Starring Jimmy Fallon” (NBC at 11:35) hosts a conversation with two very different people, musician Billy Joel and NBC correspondent Chelsea Clinton.

Actress Kaley Cuoco and NASCAR driver Dale Earnhardt Jr. swing by the “Late Show With David Letterman” (CBS at 11:35), with music from the Fray.

Actor Don Cheadle and “Scandal” star Tony Goldwyn come to “Jimmy Kimmel Live” (ABC at 11:35), and there’s a performance from Enrique Iglesias.

Rachel Lubitz