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This review is from: Doctor Who - The Sontaran Experiment  [DVD]  (DVD)
One of the so-called 'vanilla releases; this two part serial from 1975 is one of Doctor Who's shorter stories, and it bridged the gap between the intriguing 'Ark in Space' and the epic 'Genesis of the Daleks'. The story itself is not that memorable but it sees the return of The brutish Sontarans - well one brutish Sontaran - who is experimenting on human subjects in order to spearhead an invasion of Earth.
The cheaper price means that DVD extras are limited to a commentary and a short documentary looking at the history of The Sontarans in Doctor Who. For the price I still think that makes it a decent buy.