President Muffley (Peter Sellers)’s Timeline and Summary

Muffley gets the disturbing news about Ripper and Plan R from Turgidson.
He summons the Soviet Ambassador to the War Room.
Muffley orders that Ripper's base be invaded.
The President breaks the really bad news to Soviet Premier "Dimitri" Kissov on the telephone.
The Soviets shoot down the American planes as okayed by Muffley.
The Ambassador and Dr. Strangelove explain the Doomsday Machine to the President.
Merkin celebrates with the whole crew after receiving the recall code from Mandrake and recalling the bombers.
He flips out with everybody else when Dimitri calls to say that one bomber hasn't turned back.
As the nuclear holocaust goes on outside, Muffley entertains Dr. Strangelove's ideas of the human race continuing on at the bottom of mineshafts.