Gallaxhar scans the galaxy to find the missing quantonium. The scanner zooms in on earth, showing it to be very close to the center of the galaxy. Earth is actually nowhere near the center of the galaxy; it's located much closer to the outer edge.
All the main characters are pretty much taken from other sci-fi movies. The Missing Link is meant to be The Creature From The Black Lagoon (1954); B.O.B. is meant to be The Blob (1958); Ginormica is pretty much based on Attack Of The 50 Foot Woman (1958); Dr. Cockroach is copied from The Fly (1958); and Insectosaurus is based on Mosura (1961).