A middle-aged couple, on the verge of proceeding with a divorce, find themselves questioning their decision to separate when fellow friends and neighbors, oblivious to their marital troubles, assemble at their house for a 4th of July Weekend party.

Biker gang leader Kisum (Adam Roarke) loves waitress Marcia Little Hawk (Joanna Frank). Her brother Johnnie Little Hawk (Robert Walker, Jr.), the leader of a group of American Indians disapproves. At various times these two groups are adversaries and allies. The two groups join forces but crooked businessmen scheme to have them at each other's throats again. The theme song "Anyone for Tennis" is by Cream. The Iron Butterfly are heard playing their classic "Iron Butterfly Theme." Producer Dick Clark and director Richard Rush made "Psych-Out" earlier in the year.