Along with his mum, Alfie made the almost 7,000-mile (11,300km) journey to Malaysia, the furthest he had ever travelled from home.
He said Malaysia was “really fun” and he enjoyed visiting waterfalls and waterparks, while also doing school work sent from Monmouthshire.
“I missed home and friends but it was really fun out there,” he said.
Filming took place on an uninhabited island, with Alfie wearing three layers of clothing in temperatures of more than 30C (86F) to film some scenes.