Okay, here's my answer to JPX's post below. I really, really wanted this thing and never got one. As a matter of fact, I don't think I've ever even seen one in real life. The Mobile Exploration lab is, as you can see, some sort of highly ill-advised combo of jet car and towering inhabitable robot. It wasn't the vehicle you see here that enticed me so.
The trick to Micronauts were the ubiquitous pegs and holes that adorned every one of their toys, so that you could combine and switcheroo parts to your child's heart's content. Observe the image above, which comes from a catalog pamphlet thingie that came with several Micronaut toys (I've searched for this image before and I'm delighted to have finally found it). It features a smattering of possible (mostly stupid) homemade combinations, and one of them still sends my heart pitter-pattering with its coolness.
This guy. It's the stripped-down base of the Mobile Exploration Lab with a clear dome inserted in the robot tower hole, and oh my god just look at the awesome. I wanted to swoosh that thing around the house in the worst way, and it never happened.
I'm not sure I would even want a Mobile Exploration Lab today. Micronauts were flimsily made; of all my toys, they were the worst at surviving the ravages of boy-ownership and time. But I still like the look of that combo vehicle, so perhaps I'll boost the design for a Lego ship. Progress!