Krypto the Superdog

Following Batman's best friend Ace, we have to discuss Krypto. Krypto is without a doubt one of the most famous of all superhero pets having had his own television series and comic book series. Like many of the superhero pets on this list, Krypto has appeared several different times in several different ways. In his first and original appearance, he was the pet of toddler Kal-El and was sent to Earth first as a test for Kal-El's own eventual departure. In the end, Krypto gets knocked off course and arrives to Earth long after Kal-El but is finally reunited with the teenage Superboy.

Krypto has all the same super powers as Superman, just for a dog. And just like Ace he has his own disguise. He wears a brown dot over one eyes as his alternate identity "Skip", the Kent family dog. As we mentioned before, having Ace and Krypto join their owners would be a nice touch in film to show that Batman and Superman have, at least, one thing in common.