I enjoyed both The Ipcress File and Funeral in Berlin but not Billion Dollar Brain. Whilst the first two films in the trilogy had a feeling of realism about them, Billion Dollar Brain felt like it was just a send-up of the spy world(which maybe is was meant to be). From the opening James Bond type titles I felt that it was being played tongue-in-cheek. We even have a wild eyed maniac type character who wants to take over the world in the form of Ed Begley. Perhaps if Ipcress and Funeral had not been serious visits into the espionage world than Billion Dollar might be viewed differently.
Finally, the soundtrack to this film is pretty bad, which is a shame as it was written by the usually excellent Richard Rodney Bennet who wrote the wonderful soundtrack for the Julie Christie film 'Far From the Madding Crowd'.
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