The calendar is made up of 24 Cadbury purple lorries. Each vehicle represents a different door of the advent calendar. They will drive to a different location every day in the countdown to Christmas.
The ad, which has been created by Fallon London, opens with a shot of the Cadbury warehouse where workers are preparing for the festive task.
Rob Spicer was the art director, and Adam Griffin took charge of copywriting. The ad was directed by David Lodge through RSA.
The campaign will run across social media, digital, radio, experiential and in-store. PHD handled the media planning and buying.
There will also be a further three 20-second spots capturing the reactions of people visiting their local truck. These will be run through TV, video-on-demand, and online from 5 December.
Claire Low, the marketing manager at Mondelèz International, said: "Through this ad, we wanted to capture the huge anticipation felt by consumers during the Christmas Countdown.
"Cadbury has a well-loved place in family homes during the festive period, and has been bringing joy to the countdown with its advent calendars for over 50 years.
"Inspired by this, we have created the ultimate advent calendar to deliver joy in a way that only Cadbury can this Christmas."