Q in You Only Live Twice (1967), Moonraker (1979), Licence to Kill (1989) and GoldenEye (1995). Desmond Llewelyn (1914-99) played the role 17 times.
A new version of Q is introduced in Skyfall. I’m curious to see what will be his place in the rebooted world of Bond, more serious. In our era of intelligent phones and GPS, spy gadgets are less impressive than before. And too futuristic technology (like the invisible car of Die Another Day) doesn’t fit well with James Bond.