This is a updated version of my other past Solarballs. So basically if you watched all three parts of the Big Bang you should know what the past solar system is like. This takes place after Jupiter crossed to Saturn and Planet X. No Ships (you can add Ships if you really want too)

This is when Ganymede and Europe were going to find planet x, right before they found him. If you watched the episode you probably know what happened but the moons are heading to the sun and are going to ask about bringing Ganymede and Europe back an the planets are following them to try and stop them. You can be any character you want including planet x, or you can be a moon.

Past solarballs au, (your planet x) This is after Theia and Earths collision, the gas giants hate each other, The Rocky planets are shaken by the collision and the death of Vulcan. Jupiter and Saturn hate you btw, Neptune pitys you a bit. No ships (unless you want them) Outdated