Walter Lantz's Space Mouse had no relationship to the Space Mouse published by Avon Publication in the early 1950's. It seems that the Walter Lantz Studio didn't even have much, if anything, to do with the creation of this second Space Mouse character. Here and here are accounts of what happened. If you want to see the pilot, and only, Space Mouse animated cartoon, you can get hold of the Woody Woodpecker and Friends Classic Cartoon Collection Vol. 2, in the bonus section on the DVD set.
This is a story from Golden Key Comics' 1962 Woody Woodpecker #74.
©1962 Walter Lantz Productions, Inc.