The stories are completely different. Foe was written by Robert Banks Stewart to end Season 14 but he abandoned it when he was reassigned to another series. Robert Holmes then devised a different story which became Talons of Weng-Chiang. For the Big Finish audio adaptation, the story is set immediately before Talons of Weng-Chiang, so if you want to experience both stories chronologically you should listen to Foe from the Future first and then view Talons, but you don't need to have seen Talons first.

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