When Go-Joe arrives to meet his friends Callum and Macie, they are playing in a fabulous den they've built in the living room, using empty boxes and blankets. Sarah-Jane feels their energy and this gives her a great idea of where to take them on their Mighty-Mites journey: to a campsite! Callum and Macie get to grips with the mallet for the tent pegs and have a race pumping up the air mattresses!