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The Clangers have made a rocket. They set it off and, as all the best rockets do, it bursts in a cloud of beautiful coloured stars. They let off another but this one hits something and of load of assorted metal debris falls on their planet. The Clangers take cover. Then they come out and look at the odd objects. They are obviously all parts of the same thing so they carry the pieces below and assemble it. It assembles into an iron chicken which thanks them cordially and walks away through the caves.