HOW I MET YOUR MOTHER: The gang encounters a guy at the wedding who intentionally stirs up trouble among them. (Ron P. Jaffe/Fox)

The two-night finale for “The Voice” (NBC at 8 p.m.) begins with Will Champlin, Tessanne Chin and Jacquie Lee vying for votes for the very last time, plus performances from OneRepublic, Celine Dion, Ne-Yo, Lady Gaga and the coaches.

There are more wedding mishaps on “How I Met Your Mother” (CBS at 8) as a guest intentionally stirs up trouble among the gang, and after a long journey, Marshall finally makes it to the Farhampton Inn.

A man correctly predicts the exact time of his death on “Almost Human” (Fox at 8) and that leads to the discovery of a black market for vital organs and biomechanical hearts that can be remotely shut off.

Caroline’s fling with Max’s teacher leads her to a secret she wishes she didn’t know on “2 Broke Girls” (CBS at 8:30).

The most scandalous characters and situations in reality television history are remembered on “Biggest Reality Scandals” (E! at 9), including moments from “American Idol,” “Big Brother,” “Toddlers and Tiaras” and many more.

RETURNING SHOW: The fourth season of “Lizard Lick Towing” (truTV at 9:30) premieres with Amy suddenly disappearing in the midst of her repo competition with Ron, and Bobby learning the outcome of his felony charges from last season.

Ellen remains adamant that she will not kill the president on “Hostages” (CBS at 10) but she tells Duncan that she will help him get what he needs in return for something she wants.

“The Sing-Off” (NBC at 10) returns with the seven remaining a cappella groups belting hits from every recent musical generation.

On “NeNe Leakes” (E! at 10) the Athens native tells all on her self-titled special, which has her looking back at her past, including being raised without a father, experiencing domestic violence and struggling as a single mom.

Comedic actor Will Ferrell and the Top 10 list presented by 2013 Heisman Trophy winner Jameis Winston are featured on “The Late Show With David Letterman” (CBS at 11:35), with a performance from Chris Cornell and Joy Williams.

Television host Meredith Vieira is on “The Tonight Show With Jay Leno” (NBC at 11:35), with musical guest Jake Bugg.

Actors Colin Farrell and Jeanne Tripplehorn come to “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance from Megadeth.

— Rachel Lubitz