When a doomsday weapon falls into the hands of a suicidal 184-year-old woman, humanity’s only hope for survival lies with an apathetic satellite repair crew, a malfunctioning time machine, and an illegal brain-transplantation droid. Smart, sexy, and relentlessly paced, Walkin’ on Sunshine: A Quantum Physics Sex Farce runs the gamut from Einsteinian physics to gratuitous booby jokes.