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Duplicity in the Sun,
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This review is from: Doctor Who - The Two Doctors [1984-86] [DVD]  (DVD)
Having had the Three Doctors getting together to save Gallifrey and the Five Doctors save it again, why not have the Second and Sixth Doctors get together to, well, not for any particular reason, just save the Galaxies from the rampages of the Sontarans and the Androgum.
The Second Doctor is asked by the Time Lords to stop the Nine Planets Research Station from continuing their experiments into time travel. However, the head of the Station has other ideas and in alliance with the Sontarans and his chief of staff, the enhanced Adrogum Chesnai and their attack was launched when the Doctor arrived. Jamie was left for dead aboard the station, with the rest of the research teams all killed.
The Sixth Doctor and Peri turn up a while later to find the computer very uncooperative. In the process, they find Jamie who tells them he had seen his Doctor murdered, which understandably worries the Sixth Doctor. But it as all a con, aimed at framing the Time Lords for the destruction of the station.
They track the Second Doctor to present day Spain where the Sontarans and androgums had taken over a deserted villa in order to make their vile experiments on the Second Doctor for they are looking for the Time Lords secrets of Time Travel. Meantime, the androgum cook takes a hankering for human flesh.
The Second Doctor is converted to an androgum in an attempt to get the secret out of him but the cook rebels against his mistress and 'rescues' the changed Doctor so he can take him on an eating spree to Seville. After eating out the Restaurant, the androgum are less than happy to be presented with the bill and the manager is stabbed to death.
This is one of the more violent Doctor Who stories - not only for the death of the hapless Oscar, but in the way the Sontarans planned to trick the androgum and the way in which they were double crossed in turn, being melted by the acid attack. The death of Shockeye, the androgum cook, although maybe deserved, was also overdone. Jacqueline Pearce as Chesnai reprises the sort of role she played as Servilan in _Blake's Seven_