After the pre-credit sequence, Felix Leiter travels to Bond's hotel in Miami, where he finds him getting a massage from a girl, Dink. Leiter tells Bond about Auric Goldfinger and when his friend asks where he is, the CIA agent points him out just emerging from the hotel for his daily card game.
Felix Leiter is seen with a couple of times throughout the film checking on Bond's progress and making sure he does not require his help. Towards the end of the film, Leiter and Johnny at the CIA play a crucial role in the attack on Fort Knox, and it's one of his colleagues that stops the atomic bomb with only seven seconds to spare.
James Bond and James Bond Incarnations