I have vague memories of Dynomutt, probably from USA Cartoon Express or something similar where he was packaged with some other H-B goodies for my weekday evening toonfests. When my friends and I played, sometimes one of us would pretend to be him but we'd call him "Go Go Gadget Astro", since we thought he looked like Astro from The Jetsons with Inspector Gadget powers. XD