McSpankey's is a fast food restaurant that is mentioned in "Time is Money" and first appears in "Men at Work" where Jimmy upgraded its technology and transformed it into the #1 hot spot in Retroville, complete with a super computer to keep customer satisfaction at Maximum constantly. Its appeareance is a burger-shaped restaurant with a face on it.
Sheen once mentioning that he had to rent a truck just to get all the money that they were making to the Bank. Unfortunately Hugh Neutron's dislike of the restaurant brought customer satisfaction down prompting the restaurant to take flight to destroy everything on the planet that sells food.
Jimmy was able to take advantage of it's obsessive desire to satisfy it's customers by rewiring Goddard's tastebuds, making his ideal meal: 4 McSpanky burgers cooked at 20,000 degree's celcius, and the nearest place with that kind of heat was the surface of the sun, prompting McSpanky's to fly to the sun to cook Goddard's burger.
It appeared again in The Incredible Shrinking Town where it's revealed that Zix, Travoltron, and Tee found it and repurposed it into a space ship. They flew it to earth to hide from the authorities where they found the inhabitants of Retroville shrunk down to toy size with Jimmy's Shrink Ray.
They intended to use it to fly to another planet to sell the inhabitants of Retroville as toys but luckily the people they kidnapped was able to turn them against eachother and lock them in a escape pod. Assuming that Jimmy didn't dismantle or destroy the ship it's presumably been locked away with the rest of Jimmy's space ships, though it's never seen again.
It is an obvious parody of McDonald's which is the world's largest chain of hamburger fast food restaurants.