U.S. actress Emma Roberts and comic Norm McDonald have lent their voices to characters in an animated TV special "The Flight Before Christmas," CBS said Monday.

The show, "about a young reindeer with ambitions of becoming an expert flier like his father," is to air Dec. 12, the network said.

Roberts is best known for her roles in the movies "Nancy Drew" and "Aquamarine." McDonald is a former "Saturday Night Live" cast member.