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The Second Doctor emerges from the TARDIS with the Brigadier and Benton, landing in what should be their UNIT lab only to find it transformed beyond recognition. When the Brigadier …

Omega's antimatter prison traps the Doctor and his companions as reality frays around them. When the two incarnations of the Doctor bicker over Omega's nature and credibility, their clash exposes …

The two Doctors finally set aside their bickering to concentrate their combined wills, defying Omega's antimatter prison in a desperate bid for freedom. Jo's insight proves pivotal, challenging them to …