On Her Majesty's Secret Service
Australian George Lazenby's one and only appearance as James Bond sees him play the iconic martini-sipping agent, sent on a mission to hunt down Ernst Stavro Blofeld, the head of SPECTRE. 007 arrives in the Swiss Alps where he poses as Sir Hilary Bray, in order to discover Bloefeld's top-secret plan.
Beginning with the protagonist saving a suicidal woman on a beach and ending in tragedy, this 007 adventure is regarded as sadder and bleaker than your typical Bond outing. The tragic circumstances that befall 007 and his wife also explain why the iconic womanizer remains single going forward.