A retro sci-fi digital illustration in the style of a 1950s pulp poster. A large, metallic green flying saucer with a glowing rim and transparent dome dominates the starry night sky. Inside the dome, a curious white cat with bright green eyes peers out. Below, a powerful white tractor beam captures three black cats in various poses of surprise and protest, suspended in the beam's light against a deep black, star-filled cosmos. The image has a deliberate grainy, textured quality, blending vintage sci-fi aesthetics with whimsical feline humor.