BBC One has a big surprise for kids and all those with a love for animated movies and series.

Here's everything you need to know about Zog, including the cast and the plot.

When is Zog on BBC One?
Zog will air on BBC One, Christmas day (Tuesday, December 25) at 4.5opm.

The animated special is a one-off and will last for half an hour.

The special is based on Zog, a character written by The Gruffalo creators Julia Donaldson and Axel Scheffler.

It will be directed by the Oscar-nominated director of Room on a Broom, Max Lan.

Who's in the cast?
The animated characters will be voiced by numerous well-known names including a Game of Thrones heartthrob.

Here is the line-up:

Sir Lenny Henry - Narrator
Tracey Ullman - Madame Dragon
Hugh Skinner - Zog
Patsy Ferran - Princess Pearl
Kit Harington - Sir Gadabout

What is the Julia Donaldson adaptation about?
Zog is a 30-minute story about a keen but very accident-prone dragon.

He keeps getting himself in trouble while learning how to fly, breathe fire, roar and fight knights in his first four years at dragon school.

Each year he meets a young girl who patches his bruises and grazes up.

But, Zog's next mission is to capture a princess and the viewers will get to join him along his journey.