Immortan Joe

First appearance: Mad Max: Fury Road (2015)

Cars, explosions, more cars, more explosions in a post apocalyptic setting. The fourth Mad Max story. Probably my most anticipated movie for 2015, a year that sees a new Star Wars flick getting released.

The Humungus

First appearance: Mad Max II: The Road Warrior (1981)

Max Rockatansky is at it again in the oil deprived future Australia. This time he's helping a group of settlers protect a tanker trailer full of precious gasoline. Max befriends a feral boy and fights a bunch of wasteland marauders led by an hockey mask wearing disfigured muscleman known as The Humungus! Will Max survive?!

This is the movie most people are thinking of when they think of Mad Max. Lots of desert, weird cars, weirder wasteland gangs, more action.

Ro-Man Extension XJ-2

First appearance: Robot Monster (1953)

A boy named Johnny and his family fight to survive the Ro-man in a world where everyone has been killed by the Calcinator Deathray. Eventually Ro-man decides he wants to experience what life for the Hu-mans is like and is killed by his superiors. Or is he? Maybe its all a dream? I don't know but the Ro-man has a cool bubble machine hidden in a cave.
Weird little movie rumoured to have been shot over 4 days.