Wanting to set off a "tribal war" within the human race, the aliens attempt to detonate a nuclear bomb at a U.S.-Soviet disarmament summit.

A noted scientist and old friend of Suzanne's, Dr. Erik Von Deer, is being brain-washed (through signals subliminally implanted in the music of his favorite artist) into secretly working on a serum that will give the aliens immunity to Earth's bacteria. Suzanne arrives for a weekend visit while Von Deer is on the verge of the serum's completion.