Okay, this whole post was generated by:
1) Not enough sleep.
2) Early morning shower.
So, for whatever reason, I'm thinking on that "lunchbox" thread while in the shower, thinking Race Bannon would be cool. Then it hits me: Johnny Quest has got to be Race Bannon's love child!
Think about it.
* Johnny is blond, but his so-called dad has black hair.
* We never see Mrs. Quest. I can assume she died in an earlier dangerous adventure before the good Dr. ever found out about the affair.
* Johnny is a pretty adventerous and ballsy kid, while Dr. Quest is a pretty wimpy, brainiac type.
So, it's got to be that Race Bannon is REALLY Johnny's dad. While Dr. Quest was busy in the lab, Race was busy with Mrs. Quest (probably in the mile-high club on that cool jet they use all the time).