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Space Beacon Alpha 4 was a space beacon built by the government. While chasing the Argonite pirates led by Maurice Caven, who had destroyed Beacons Alpha 1 and Alpha 7 for their argonite, General Nikolai Hermack left Lt. Sorba and a few other Space Corps guards on board the Beacon. The Second Doctor, Jamie McCrimmon and Zoe Heriot landed on the Beacon and were chased by Sorba and his men just before the Beacon was blown up by the pirates. The pirates only blew it into individual segments. The Doctor, Jamie and Zoe were stuck on a segment of Alpha 4 before being rescued by Milo Clancey. (TV: The Space Pirates)