The 30-second spot, created by BMB, opens with an epic film scene with two knights in armour travelling on horseback down a hill in a medieval countryside.
The knights, who have beards and gruff voices, stop to enjoy a Dairylea snack, and then laugh at each other when one fails to get a snack past his helmet into his mouth.
One of the knights then declares: "Let’s do this – mum’s picking me up at six," and, as they set off yelling "charge!" the scene suddenly changes and instead two nine-year-old boys are racing down the hill together on bikes in familiar suburban surroundings. The knights were the boys’ make-believe characters.
The campaign is designed to drive awareness of the snacking cheese category during the back to school period after the Easter holidays. It breaks on TV on 4 April and will run for four weeks as part of a £1.2 million campaign that will also feature in-store, digital and social media activations.
Joe Fitzgerald and Kim Hutcheson from BMB created the TV spot, which was directed by Phil Lind through Mad Cow.
BMB won Dairylea's ad account in 2011 after a competitive pitch, which ended a long relationship between the Mondelez International brand and J Walter Thompson London.
Kraft Foods, the maker of Dairylea, renamed its global snacks business to Mondelez International in 2012.
Philip Warfield, the senior brand manager at Dairylea, said: "Dairylea has long been part of the nation’s childhood, so with this campaign we really wanted to celebrate the carefree spirit of childhood and imaginative play.
"The ad brings this to life as we go on a journey with two boys in their own imaginary world, embarking on an adventure fit for a knight! Something we think all parents can relate to."