Who is the greatest?

This question has occupied the minds of philosophers, sages and bookies since the beginning of time. Who, or what, occupies the pinnacle of the pyramid that is life?

Wonder no longer. Using the vast resources at my command I have decided to answer these pressing questions once and for all.

Sixteen of the finest contestants were selected and then randomly paired off. The final winner is determined by a series of contests ala March Madness.

To the fights:

Who is the greatest foe of the supernatural?

What is the most fearsome monster of all?

Which evil robot is the most EVIL?

Which cereal mascot is the toughest?