I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Laserblast Movie plot: A green-skinned man wanders through the desert with a laser cannon attached to his arm. A spaceship lands and two aliens emerge, one of whom shoots the man, which disintegrates his body. The aliens depart on their spaceship, leaving behind the laser cannon and a metallic pendant the man was wearing. Teenager Billy Duncan wakes up in his bed, seemingly disturbed, and learns his mother is leaving for vacation. He goes to visit his girlfriend Kathy, but her deranged grandfather Colonel Farley makes him leave before he can see her. As Billy drives around town, he is harassed by bullies Chuck Boran and Froggy, and by two police deputies who give him a speeding ticket. Billy wanders into the desert and discovers the laser cannon and pendant. He starts playing with the cannon, pretending to shoot things, then realizes he can fire the weapon while wearing the pendant. Meanwhile, on the alien spacecraft, the two aliens converse with their leader who shows them footage of Billy using the cannon, prompting the aliens to turn their ship around to head back to Earth. Context implies that the two aliens, upon departing Earth, left the cannon and pendant behind under the presumption that no other human would be able to use them as the green-skinned man had, but they have now learned that they were in error. Later that night, Billy and Kathy attend a party where Chuck and Froggy attempt to rape Kathy. When Billy discovers them, a fight breaks out. Later that night, Billy uses the laser cannon to explode Chuck's car, and Chuck and Froggy barely escape the explosion alive. Government official Tony Craig arrives to investigate both the explosion and the desert where Billy found the cannon. Tony informs the local sheriff that the town must be sealed off. Feeling sick due to an unusual growth on his body, Billy visits Dr. Mellon, who surgically removes a metallic disc from Billy's chest. Mellon calls the police laboratory technician Mike London to arrange for the disc to be investigated. A green-skinned Billy opens fire on... My question: What is the first name of Billy Duncan's girlfriend in the movie?
Kathy