Batman + Superman + COW = ???

I just got done playing Lego Batman 3, and there are SO MANY CHARACTERS to unlock. Seriously, like 150. And while a lot of the comic book characters I recognized -- Joker, Lex Luthor, Hal Jordan and the Green Lanterns -- there was a WHOLE lot more that I didn't, like a half-Superman, half-Batman hybrid, and a robotic Superman, and a Batman COW! So I'm digging deep into comic lore to shed some light on these lesser-known characters, and what I've found is that the characters you DON'T know are WAY cooler than the ones that you DO!