After you return to your place, the head of your gang calls you over.
"We got the essence of our power in liquid form," he starts, eliciting grins all around. "But now we got it in da slurpee." He holds up a jug of liquid, which he presents to you.
"Your mission is to take our mission deep south and liberate as many enslaved brothers as possible. This stuff don't work on women, so don't waste it there. Tell them some story, like this stuff will reveal who in their shitty little town is part black, or something like that. They'll jump on it, I guarantee it."
"But why would they listen to me?" you ask.
"Sorry, but we're going to have to turn you back into your old self for a while, else they ain't gonna buy you or your story."
So the deed is done, you are returned, reluctantly, to your original white, blond-haired, blue-eyed state, though now in your 20's, and you set out south, to a tiny little southern town where the emancipation proclamation never quite took effect...