I need help figuring out the name of a movie I saw years ago. It was either from the 90s or the very early 2000s. I only remember seeing two characters, the main actress and the creature she is stuck with. They’re in what looks like maybe a warehouse or something and he’s telling her about how he’s killed many etc. He was kind of like Radu from the Subspecies films but I looked those up and it’s not it. And I swear at one point he had some machine or device that he needed and something about some bright green fluid but maybe I mixed that up. At the end he like flies out or jumps out of the roof hatch and it appears that it’s apocalyptic outside. Or maybe she killed him and she went out the roof hatch and sees spacecrafts or something?