An alien race from another planet is bent on destroying not only the Earth but its entire galaxy. Croyd, a superhuman secret agent of the future, who has the ability to move himself and events uptime or downtime, is assigned to prevent this destruction. But Croyd's body becomes inhabited by the mind of a "gnurl" princess, Lurla, an alien agent who has infiltrated Earth, while his own mind is transplanted into the body of a surprised female Earthling! Trapped in this inferior body, Croyd must work fast to recover his own. At the same time, he must destroy Lurla, before she has time to complete her deadly mission.