The "Star War Episode 7" production is already underway despite Lucasfilm and Disney confirming filming will begin in May.

In an interview with The Hollywood Reporter, Disney Studios Chairman Alan Horn confirmed the production is moving along despite an incomplete cast.

"We have a lot of them [in place]," Horn told THR about the principal cast. "We're just not completely done yet."

Horn also revealed the "Star Wars" production's biggest issue was with their script, but assured the screenplay is right were it needs to be to keep on schedule. "Star Wars Episode 7" will be released to theaters on Dec. 18, 2015.

The Disney executive did not divulge plot details or casting news to THR, but "Lost" actor Dominic Monaghan recently dished about a conversation he had with "Star Wars" director J.J. Abrams about the casting process.

"[Abrams and I] talked about it a few times. Once I knew that he was doing 'Star Wars' I sent him a little congratulatory message and stuff," Monaghan revealed to DweebCast. "We've talked a few times about it and he said 'We're putting together a cast of essentially unknowns. We want to follow the '77 'New Hope' cast'."

"Because obviously Harrison Ford wasn't well known at that point, Mark Hamill wasn't and Carrie Fisher wasn't either," he added. "What he said was, 'We don't want to fall into that mistake of people going 'Oh it's that guy from that thing!' and then you're completely out of the 'Star Wars' universe.' "

Big name actors with rumored connections to the "Star Wars Episode 7" cast include Lupita N'yongo, Adam Driver, Chiwetel ejiofor, Gary Oldman and Benedict Cumberbatch, along with the three franchise actors Harrison Ford, Carrie Fisher and Mark Hamill.

Which characters would you like to see return in "Star Wars Episode 7?" Let us know in the comments section below.