How does the spring edition of “Wipeout” (ABC at 8) differ from the winter and fall versions? Besides better weather, not much changes as people still fall down a lot and participate in ridiculous challenges. Thursday night, this includes a new bowling-themed obstacle and a kitchen-themed activity involving chocolate.

After weeks of female contestants exiting the show, will a guy finally leave “American Idol” (Fox at 8)? We’ll find out, but only after a Rihanna performance and former “Idol” winner Kelly Clarkson’s duet with country singer Jason Aldean.

Paul Reiser takes a page from the Larry David School of What to Do Years After Your Sitcom Ends with “The Paul Reiser Show” (NBC at 8:30), as the new comedy series follows the former “Mad About You” star in his daily life during a “Curb Your Enthusiasm”-esque series. Speaking of which, David makes an appearance on the premiere to compete against Reiser for a job on a game show.

It’s finally happening — Michael Scott (Steve Carell) begins his departure from “The Office” (NBC at 9), but he needs a replacement first. Cue guest star Will Ferrell, who plays the new manager that everyone tries to impress . . . except Dwight, naturally.

A mythbuster television show host’s remains are found in the woods, and ironically he appears to have been killed by the mythic creature Chupacabra on “Bones” (Fox at 8), leaving Booth and Bones to investigate the mysterious circumstances.

Andy and April decide to start acting like an adult couple and host a dinner gathering on “Parks and Recreation” (NBC at 9:30), while Ann, determined to get back out on the dating scene, heads to a singles party.

Always beware of an ice sculptor with a sense of humor! The team on “Ice Brigade” (Food Network at 10) help an employee play a prank on a co-worker and replace everything in an office with ice sculptures.

Now that Liz knows Tracy’s not really in Africa — his Skype calls were from a very convincing soundstage — she teams up with Kenneth to find the missing star of her television show before it gets canceled on “30 Rock” (NBC at 10).

Comedian Seth Meyers is a guest on “Late Show With David Letterman” (CBS at 11:35), along with New York Knicks star Carmelo Anthony and musical guests TV on the Radio.

“The Tonight Show With Jay Leno” (NBC at 11:35) hosts actor Tyler Perry, reality star Kendra Wilkinson and a performance by Bright Eyes.

— Emily Yahr