He's going to hang from a crane in a small plastic box, without any food, for six weeks.
He'll be doing it in London, the first time he's tried one of his crazy feats outside America.
The event, which starts on 5 September, will be shown on Sky One and Channel Four.
Some people might think he will cheat, but Blaine said: "There will be no trickery and no means of escape."
He will leave the box on 19 October.
We do not recommend hanging from a crane in a small plastic box for six weeks.
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