I guess this because I have seen this episode a few times while I was in primary school. This episode seems to be the most popular in my opinion because it is about time travel so it's almost like a science-fiction film.
The episode is a about a teenage boy named Mike who while flying in his hang- glider accidentally runs into a time warp which transports him to the year 2450 which is a post-apocalypse world. The Earth has been devastated by a nuclear holocaust and civilization is reduced to a primitive state of quality. This age is filled with Viking like warriors, "cannibals " and strange mutants referred to as "wonderer's'.
Mike lands near a tribe of people called the "Clan Murray" who say that they are suffering from radiation sickness and need his help, to get to a near bye island across the sea by flying there in his hang-glider. Because on that island are a group of nuns who have a cure to the "sickness". Mike refuses at first but eventually agrees to help. So he travels the desolate land with a young female warrior as his guide, to get to the cliffs and fly to the island.
Personally I think this episode is rather good, but I'm not sure how long school students will watch it.
