I mostly associate him with Jeff Rosso in Freaks and Geeks (one of the Higgins boys is on there as the AV guy, too, I forget which one), and was a hippie in an episode of Mr. Show.
Fuck I used to watch Supercar when it was on TV for real! It was my favorite show, and my second favorite show was the original black and white AstroBoy. i had a plastic toy supercar coul;d be "programmed" to take different manuevers by changing a little orange disk in the back.
it blew my mind to see SuperCar on HB&G. Turns out it wasn't very good, (except of course, for the Theme song!) but I found the original AstroBoy episodes in a wonderful video store in Maine, and it was great. Some people consider it to be the first anime.
My favorite Higgins Boys bit was when they found the barbie head in the stomach. or the safety first bits. or the chain smoking. or the table. or just about everything.