Those scores are just default high scores. Most games have the default high scores set with the designer's/programmer's/etc initials. Some games (most Sterns and I believe some WPC-era games too) allow you to adjust the default high scores. We don't have an Avengers around here yet so I don't know the specifics on if that game used the designer's initials, but Stern tends to do that. If it's anything like X-Men and a few other Sterns (Iron Man comes to mind), I'm sure those scores are actually pretty high! You could take the easy way out and set them stupidly low, or you and your kids could just try and beat them!
Post edited by KevinDDR : Fixed info