Early character designs.

If you are fan of the show, it is well worth your while (though not an easy task) to track down the book Alex Toth: by Design. It features model sheets of Toth's work on various H-B series, but especially the hero shows. There are a few showing the early character designs, with a different cape and cowl, the controls for the ray beams on his belt, and a slightly different emblem. That is then followed by the revised and final design, showing the changes that led to the SG we know and love. There is one piece of artwork that even shows what Space Ghost is supposed to look like, under the mask. It's filled with a lot of great work and even touches on his early work for Cambria (Space Angel) and later work, like Bionic Six.

"Fortunately, Ah keep mah feathers numbered for just such an emergency!"