"What are you doing? These people are innocent!"Just have him be a evil dark version of Preston in the Madnessverse, so give him a goatee and some eyeliner and we're done here. I'm now imaging good Sgt Preston vs Madnessverse Sgt Preston.
"No, they're guilty! They are guilty of being beneath even Inferiors, unfit to share God's Earth with the Pinnacle Man!"
"...you're insane. On, King! On, you huskies!"
*gunfire and dogs barking*
*grunting sounds of a scuffle*
*one of the Prestons wins*
"WILL SERGEANT PRESTON TRIUMPH OVER HIS EVIL DOPPELGANGER? STAY TUNED! BUT FIRST, HAVE YOU EVER TRIED QUAKER (TM) POPPED RICE AND QUAKER (TM) POPPED WHEAT, THE ONES SHOT FROM GUNS, WITH RESTORED NATURAL GRAIN AMOUNTS OF VITAMIN B1, NIACIN, AND IRON???"
...yeah that'd be pretty fucked up.