I was watching the Guns of Navarone again on DVD, and reflected that there was a close connection between its sequel, Force 10 from Navarone* and the James Bond films.
To begin with, the director, Guy Hamilton, had directed four of the James Bond films, starting with Goldfinger. Then they got a roster of James Bond villains in key roles – Richard Kiel (who’d played Jaws in two Bond films), Robert Shaw (Red Grant in the second Bond film, From Russia with Love), and Barbara Bach (the title role in The Spy Who Loved Me, unless you concede that Bond was, and she was “me”). They got Edward Fox to take David Niven’s part as Miller. He hadn’t been a Bond villain, but he was the Jackal in day of the Jackal. And to complete the Bond stuff, he was M in Never Say never Again.
And, of course, Harrison Ford, who has no direct Bond connection, but was definitely the Bond competition in the Ludicrous Action Adventure Film set as Indiana Jones. Plus premier Bond Sean Connery played his father in the third Indy film.
If you include the original Guns of Navarone, you have David Niven, who was played Bond himself in Casino Royale and you have Walter Gotell as Leutnant Muesell, who played SPECTRE agent Morzeny in From Russia with Love and General Anatol Gogol in six Bond films (and the TV series James Bond, Jr.).
That seems a bit more than coincidence – I realize that they’re action/adventure series, but this looks like a deliberate effort. You don’t see so much crossover between Bond and Indiana Jones, for instance. But you do see such crossover between Bond and, say, The Avengers (four of the titular Avengers showed up in major roles in the Bond films)
*Made in 1978 and sorta based on the book of the same title by Alastair MacLean, who also wrote the book The Guns of Navarone. The sequel used scenes from the earlier film, made 17 years earlier, but none of the same actors. I have no idea what possessed them to make such a delayed sequel. Unabashed greed, I suspect.