>>122228859Pink Diamond had a Companion gem named Spinel who she got bored of and told her "Wait here until I come back." but never went back for her, a thousand years or so later the whole Rose-Quartz thing happened, then another few thousand years Steven is show to all of homeworld as the new pink diamond in the new Era. All the time, the Companion Gem Spinel has been stood in the same spot in the overgrown garden thinking Pink Diamond will eventually come back for her and this is just a really long, really boring game. She naturally flips her shit realises the she was absolutely abandoned and forgotten so hijacks some old war-tech to genocide earth.
She has a Restore-to-factory-settings scythe which BTFO's the crystal gems leaving them thinking they are brand new gems. Amethyst doesn't know anything about anything because she is deformed, Pearl thinks she was fresh ordered for her new master Greg, Ruby thinks she is a soldier sent to protect Sapphire, Steven has lost all his powers because he has been reset to episode 1 level shtick, Spinel also gets hit, turning from Punished-Edgy-Gem into Goofy Companion for Pink Diamond while they all try to find out what the fuck is going on and re-teach the Gems who they are. Amy by connecting with her as a friend, Ruby and Saph' by getting them to love eachother and later Garnet to embrace the Truth. Pearl unironically by the power of Chad Universe Cock. Spinel by reminding her why she went rampage which is also revealed as pretty justified, there wasn't any catch to why Pink abandoned her like getting caught up in the whole earth thing, she just genuinely got bored and abandoned her. Spinel still beats Steven up despite all the crying and singing, but tires herself out and realises that even if she was totally betrayed by PD, Killing Steven/Earth doesn't fix shit so she just gives up.
The Diamonds arrive to help after everything is winding down and they bond with Spinel, because she reminds them of how Goofy Pink was.