'Once Upon a Time' Season 4 Casting News: "Once Upon a Time" producers announced that Tyler Jacob Moore and John Rhys-Davies will be joining the cast in season 4.

According to E! Online Tyler Jacob Moore will play Frozen's Prince Hans on Once Upon a Time and The Hollywood Reporter reported that John Rhys-Davis will lend his voice to the role of Pabbie the Troll King, which will be done in CG.

Producer Adam Horowitz took to Twitter to announce "We're thrilled to welcome John Rhys-Davies to the #OnceUponATime family as the voice of everyone's favorite rock troll -- Pabbie! #ThisFall!"

In May Horowitz told THR  "We fell in love with [the movie] when it came out last year like everyone did, and we want to do our best to do it justice," he said at the time.

Best known for his most recent role in "Shameless," Tyler Jacob Moore has also appeared on ABC's controversial GCB (Good Christian Bitches), as well as the series "Revenge."

John Rhys-Davis is best known for his roles in the "Indiana Jones" movie franchise and in "The Lord of the Rings." Pabbie the Troll King is the ruler of the Valley of the Living Rock. The Hollywood Reporter says that Pabbie is described as a "gentle, wise and the source of unexpected insight."

Moore isn't the only actor who will be playing one of the now-iconic characters from "Frozen." Georgina Haig, best known for her part on the Fox Series "Fringe" has been announced to take on the part of Elsa. Other Frozen characters who will debut on the show are Scott Michael Foster and Elizabeth Mitchell, who's role has not yet been announced.

Scott Michael Foster from "Greeks" will play Kristoff and Elizabeth Mitchell from the cult series "Lost" has been cast as either the Original Snow Queen or Elsa and Anna's mother. Anna's mom supposedly died at the start of the movie.

E! Online broke the news that Hans would be making the transitions from big screen to small. Hans is the treacherous ex-lover of Anna, played by Elizabeth Lail. Hans tricked Anna into falling in love with him in an attempt to take over Arendelle. It has been reported that Hans will still be a nasty character who wants to the be king.

Hans was last seen in chains being brought back to the Southern Isles after being banished by Elsa (Georgina Haig).