The Threat from Beneath was a Third Doctor TV Action comic strip story. It was reprinted as a Fourth Doctor comic strip story in the 1977 Doctor Who Winter Special and retitled Invasion.
In its original version, it was the "big story" of TVA #112. That meant it got pride of place on the issue's cover and was the longest story in the issue. It was one of the few Doctor Who stories to depict a nuclear explosion on Earth. Moreover, it may be the only story where the Doctor orders a nuclear weapon detonated in Earth's atmosphere.
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