The 30-second spot, called 'Carol of Believers', aims to convey the wonder of Christmas.
It is the first TV work created by Mother London since it won the account in July 2008.
The ad opens on a group of children singing 'Deck The Halls' in a town square to an audience of passers-by. One by one the audience is transformed into Christmas icons, such as a snowman, a reindeer and elves, until one boy in the choir sings half-heartedly and turns one of the members of the audience into an ostrich.
But once the unenthusiastic singer has eaten a Thorntons chocolate, he sings with gusto resulting in the transformation of the ostrich complete with a Santa's beard, hat, boots and belt.
The spot ends with the voice over: ‘Thorntons. We can all believe,' and an offer message of three for two Christmas gifts. The campaign will run from December 1-8.
Stuart Renshaw, head of brand, Thorntons, said the ad captured the ‘true wonder and joy of the season through the eyes of fellow believers'.
According to Thorntons annual report, profit before tax decreased by 4.5% to £8.1m while revenue increased by 3.2% to £214.8m. On average Christmas generates 40% of the company's sales.
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