a'Once Upon a Time' Season 4 Release Date, Cast Rumors: Tyler Jacob Moore & John Rhys-Davies Join the Show

As 'Frozen' and 'Once Upon a Time' unite, more and more cast members are becoming confirmed for their appearance on the hit ABC Network TV series, including Tyler Jacob Moore and John Ryhs-Davies.

According to PEOPLE, the ABC series will get Moore to play as Prince Hans. Meanwhile, Rhys-Davies will be the voice of the adorable troll kind, Pabbie. Moore is known for his role in 'Shameless' as Tony Markovich, while Rhys-Davies on the other hand, is popular for his role as Gimli in the 'Lord of the Rings' trilogy.

The announcement came after the production team released a sneak preview of the upcoming fourth season at a Comic-Con panel.

Show creator Adam Horowitz welcomed these new casts to the show when he posted on his Twitter account to confirm the news, "We're thrilled to welcome John Rhys-Davies to the #OnceUponATime family as the voice of everyone's favorite rock troll-Pabbie! #ThisFall!" he tweeted.

"Excited to welcome @tylerjacobmoore to #OnceUponATime as #Frozen's Hans. Hope you come meet him this fall is Season 4!" he added.

Other characters who will appear on the show include Queen Elsa (to be played by Georgina Haig), Princess Anna (Elizabeth Lail) and Kristoff (Scott Michael Foster).

Elizabeth Mitchell was also cast for another major role. However, the character has not yet been disclosed. Horowitz and Edward Kitsis, show's co-creator, hinted that Mitchell could be playing the role of Elsa and Anna's mother.

The first episode of 'Once Upon a Time' Season 4 will air on Sept. 28 on ABC.