Are you sure it's from the Intrepid set (do you have a scan of the back)? That set has a black promo card and an acetate case topper but I can't find any information that there's any other cards that aren't standard base/chase. Also, can you tell from the hairstyles etc what season/movie the image is from?
It could also be a promo included in DVDs or something like that. I suggest you contact Donna who owns
this collection as she seems the best person to identify the card properly. Once it's identified, it should be much easier to find.