Apparently Nick Cave wrote a script for a Gladiator sequel as a favour to Russell Crowe. Unsurprisingly, as you’ll see once you read what’s below, it was never made:
Maron: What was the story for the second Gladiator?
Cave: Well, that’s where it all went wrong. Very briefly, it was, I’m like, “Hey, Russell, didn’t you die in Gladiator 1?” He’s going, “Yeah, you sort that out.” So, he [Maximus] goes down to purgatory and is sent down by the gods, who are dying in heaven because there’s this one god, there’s this Christ character, down on Earth who is gaining popularity and so the many gods are dying so they send Gladiator back to kill Christ and all his followers. This was already getting… I wanted to call it Christ Killer, and in the end you find out that the main guy was his son, so he has to kill his son and he’s tricked by the gods and all of this sort of stuff. So it ends with, he becomes this eternal warrior and it ends with this 20-minute war scene which follows all the wars in history, right up to Vietnam and all that sort of stuff and it was wild.