Trying to find a show

I'm sure this won't make any sense at all and just sound like absolute gibberish, but here goes nothing:

I'm trying to remember the name of a show that's been in my head the last few days. I can't really remember the channel, I just know it was always on Saturdays, and I would watch it either before or after This Week In Baseball and Endurance. I have a vague image of it being a show in which two teams of preteens build something and compete against each other. One of the hosts was a guy who always wore a visor, and his spikey blue hair would poke out from the top. Any idea what the hell I'm talking about?