The comedic actor will pen the sequel to 'Twins' starring Eddie Murphy

Book of Mormon actor Josh Gad has signed on to write Triplets.

Gad, who played Elder Arnold Cunningham in the Tony-winning Broadway hit written by South Park creators Trey Parker and Matt Stone, will team up with Scriptshark website executive Ryan Dixon to co-write the sequel to the 1988 comedy Twins, reports The Hollywood Reporter.

Twins saw Arnold Schwarzenegger and Danny DeVito play Julius and Vincent, fraternal twins who were conceived experimentally and separated at birth. But in a twist for the new film, they will discover that they have a third brother, played by Eddie Murphy.

All three actors are believed to be on board, and Ivan and Jason Reitman’s production company Montecito. However, Ivan Reitman will not return as director, instead acting as producer.

Schwarzenegger last year announced his intention to return to acting after finishing his term as Governor Of California. The action star can next be seen appearing in The Last Stand, which opens in the US on January 18 next year, before arriving in UK cinemas on January 25.

Meanwhile, the resurgent Schwarzenegger has recently signed up to play Conan the Barbarian for the first time since 1984.