What if Sarah servived? What if she was experimented on? What if she has a twin? What if they were the most powerful? This has seens where it's not the same as the actual show so don't start moaning that it's not in the show. MacKenzie Lee Hopper is Jim Hoppers second daughter and Sarah Hoppers twin sister. She and her sister 'died' according to the doctors and there parents believed it but what really happened was Dr Brenner was there and he started to experiment with them after there parents left and 6 years later there are 12 now. What happens when. There found lurking around the lab and there taking to demo-dogs. There is no (MacKenzie + someone) Or (Sarah + someone) I own MacKenzie and Sarah's lines