to bring him back alive or kill him and any other intelligent beings to protect their mission to Earth. The rest of the crew return to their home world, leaving the Gargon behind in a nearby cave. Meanwhile, Derek arrives at the address he found on the dog's tag, where he meets Betty Morgan and her Grandpa. They have a room to rent, and Derek inadvertently becomes a boarder. When Betty's friend, reporter Joe Rogers, cannot make it to their afternoon swim at Alice Woodward's place, Derek tags along with Betty. He shows the tag to Betty, who recognizes it immediately. Derek takes her to the place where the spacecraft landed and shows her Sparky's remains. She does not believe him, so he describes Thor's weapon that can also vaporize humans. Betty takes this surprisingly well and vows to help Derek stop his crew mate. For the rest of the day Betty and Derek have several run-ins with Thor, who vaporizes several humans, including Alice and Professor Simpson from earlier, and Joe follows up on stories of skeletons popping up all over town. Eventually Thor is wounded in a shoot out with the police. And he then kidnaps both Derek and Betty to help him receive medical attention, in the process revealing Derek's true parentage to them. Two car chases and a gunfight follow, and Thor is finally captured by Earth authorities after plummeting off a cliff in a stolen car. Shortly after, the Gargon grows immensely large, after devouring a policeman investigating the alien's landing site and attacking numerous people. Derek and Betty go to the car wreck site to look for Thor's raygun. They kiss, and Derek vows to stay on Earth. The Gargon suddenly appears and ruins their romantic moment, but Derek finds the raygun under a rock just in time for them to escape. Unfortunately, it is damaged and out of power. The giant Gargon begins heading towards the town. They follow and confront it, having used the electricity from the overhead power lines to fuel the raygun's components. Derek eventually kills the monster, but it's too late. The invading fleet appears in Earth's orbit. Derek retrieves Thor from the police and everyone, including Joe and Grandpa, hurry to the landing site. He then reunites with the Captain and meets his father for the first time. Derek pretends to feel regret for his insubordination and offers