The Deadly Seeker Returns follows a rebellion within the under surface community on the planet Venus by a group of biochemical robots where one escapes in a spaceship and crashes into Earth on California's Saddleback Mountain. The rebellious creature goes on a killing spree, terrorizing the county, as it sets up beacons to guide his followers to Earth.
After the humanoid beast hideously kills his brother, State Park Ranger Brad Evans and a member of his staff, Ranger Julie Adams, resolve to avenge his death. Brad is motivated by his mentor, a university professor, and his mother's silver medallion found on his dead brother. Heeding kind words of his mentor, Brad turns remorse and anger into willpower and determination. Brad and Julie follow a trail of killings that takes them through the cities, foothills, canyons, and mountains of Orange County California, discovering romance along the way.
With the help of a pudgy deputy, an Air Force colonel, and the U.S. Forest Service, they corner the creature in a fiery battle on a remote tree covered mountain top. The significance of the medallion and the motivation of his mentor lead Brad toward the annihilation of the Deadly Seeker and further his closeness to and affection for Julie.