"You didn't even have to read my mind. You know, I've been working with mutants as long as you have, Xavier... but the most frustrating thing I've learned is that nobody really knows how many even exist or how to find them - except you. Unfortunately this little potion won't work on you, will it? You're much too powerful for that. Instead we'll go right to the source. Allow me to introduce mutant 143. The fluid secreted by his brain acts as a mind-controlling agent. But that's only where it begins."