Participant Media and Walden Media have joined TIK Films and Lionsgate’s drama “Wonder,” starring Jacob Tremblay,  Julia Roberts and Owen Wilson.

Todd Lieberman and David Hoberman will produce the Mandeville Films production. Participant and Walden  will co-finance and executive produce the film, which will be released on April 7.

Also starring are Noah Jupe, Bryce Gheisar, Izabela Vidovic, Danielle Rose Russell, Millie Davis, Elle McKinnon, recent Tony Award-winner and “Hamilton” co-star Daveed Diggs and Mandy Patinkin.

Tremblay is starring as August Pullman, who was born with facial differences that prevented him from going to a mainstream school earlier in life — and then became an unlikely hero when he entered the local fifth grade.

Roberts plays Tremblay’s mother in the adaptation of Raquel J. Palacio’s novel and Wilson will portray the father.

Stephen Chbosky is directing from a script by Jack Thorne and Steve Conrad. Palacio’s book has sold more than 2 million copies since it was published in 2012.

Diggs, who had his last performance in “Hamilton” on Friday, joined the cast last week. Production on “Wonder” began on Monday.