I am sure you have figured out who would win the "Batman Vs. Bruce Lee" fight.
But how about "Sarkastodon Vs. Black Rhinoceros" or "Columbian Mammoth Vs. Spinosaurus" or "Gorgonops Vs. Short-faced Hyena"? A message-board dedicated to "Interspecific Conflict" tackles such face-offs. (The main site covers carnivores in general. I ended up on that site while looking up "Dhole", the Indian wild dog, but as you can imagine, that search got hijacked by the conflict board...)
(What is an interspecific conflict, you ask?)