Kermit the Frog is the most famous Muppet
Actors Whoopi Goldberg and Richard Griffiths have signed up to star in a Christmas special of children's TV show The Muppets, according to reports.
Trade magazine The Hollywood Reporter added Soprano actors Tony Sirico and Steve Schirripa would also appear in Letters to Santa - A Muppets Christmas.
Favourite characters such as Kermit the Frog and Miss Piggy will be included in the one-off set on Christmas Eve.
The show will feature songs by The Muppet Movie songwriter Paul Williams.
It is set on Christmas Eve when Kermit and company mistakenly avert three letters en route to Santa Claus.
The mistake triggers a race against time to bring a happy Christmas to the children whose wishes were lost in the mail.
Last year Ben Stiller and Alicia Keys starred in Elmo's Christmas Countdown, which starred the Muppets' Sesame Street cousins.