Centuries of junk food and snacks have taken their toll on Santa's waistline.

With narrow chimneys now a danger, Mrs Claus decides that it's time for Santa to change his diet and start exercising.

The reindeer, keen to lighten their load, are only too happy to help.

But there's a fatal flaw in their weight loss plan... they think they can help by eating all of Santa's sweets for him.

This leads to a troubled take off when Christmas comes around.