I think it'd be cool if you find an item in creature stage and that allows you to change to tribal stage then you find out a space ship gave it to you when you get to the space stage and then the race that helped you out there starts talking to you.
"I always laugh at people who care about a FPS over their framerate." - vonblade
I think that the Brain Surgeon badge description is erroneous because i have received the badge after promoting a civ to space age and not after promoting a creature to tribal. So basically, I think the badge if you advance any race to the next phase