'Dumb and Dumber' Sequel Adds Steve Tom, Rachel Melvin, Laurie Holden (Exclusive)

"Walking Dead" actress Laurie Holden has also joined the cast of Universal and Red Granite's sequel.

Universal and Red Granite's Dumb and Dumber sequel is rounding out its cast by adding Laurie Holden, Steve Tom and Rachel Melvin.

Directed by Bobby Farrelly and Peter Farrelly, Dumb and Dumber To catches up with the dim-witted best friends Lloyd Christmas (Jim Carrey) and Harry Dunne (Jeff Daniels) 20 years later as they hit the road to find Harry's illegitimate daughter for a kidney transplant.

The Farrelly brothers will produce with Red Granite’s Riza Aziz and Joey McFarland along with Bradley Thomas and Charles Wessler.

PHOTOS: Jim Carrey's Most Incredible Onscreen Transformations

The new additions to the cast will play the Pichlow family.

Walking Dead star Holden is not the female lead, but will play the key role of Adele Pichlow, the wife of a wealthy doctor who has hatched a nefarious plan involving the lives of her husband, Dr. Pichlow (Tom) and her step-daughter Penny (Melvin).

After New Line and Warner Bros. declined to move forward on the sequel, Universal and Red Granite picked up the rights to the project in June. Under the deal, Red Granite will produce, finance and distribute Dumb and Dumber To while Universal has acquired the film’s domestic distribution rights.

The 1994 original, made when Carrey was just a rising comedy star, cost $17 million to make and grossed more than $247 million.

STORY: Dumb and Dumber' Sequel: Universal, Red Granite Rescue Pic

Tom, whose film work includes The Guilt Trip and The Campaign, is represented by O’Neill Talent Group.

Melvin has appeared on Days of Our Lives and Heroes. She’s repped by ROAR and Innovative Artists.

Holden has played Andrea, a human survivor after the zombie infestation, on AMC’s The Walking Dead since the show’s first season. She's repped by APA and Alan Wertheimer of Jackoway Tyerman Wertheimer Austen Mandelbaum.

E-mail: Rebecca.Ford@THR.com

Twitter: @Beccamford