Spacecase is the first part of the 11th episode of season one in Dexter's Laboratory, which aired on December 11, 1996. In this episode, Dexter sends Dee Dee away with a group of aliens. However, he wishes for her back after realizing how much he cares for her.
The orange spacesuit Dexter wears to go save Dee Dee is a reference to the real-life orange suit NASA Advanced Crew Escape Suit dubbed "Pumpkin Suit", it is worn at various times by astronauts and is said to be related to the United States Air Force.
The battle aircraft Dexter pilots is launched from the top of his house...indicating more possible evidence that his lab could be underground and that his room is only an entrance to the lab.
The later episode Misplaced in Space shares a similar plot with this episode, but with Dexter and Dee Dee's roles reversed.
As Dee Dee waves goodbye to Dexter while on the alien space craft, Dexter's house can be seen and it is inverted (the garage is on the left when it is suppose to be on the right) This could be just cartoon logic to excute a vanishing viewpoint.
In the beginning of the episode Dexter's house appears at normal size, yet later as he goes to save Dee Dee and the dog barks at his house, the house is seen as unusually small in this episode. The garage is all seen as tall as the house which is all an error.
In this episode there is no chimney on the usual left side of Dexter's house.