The past
There is alot to tell, since so much had changed in the time gone by.

It has been a year since the war for Zebulos, with all of the opposing armies' leaders presumed dead, Axle Gear was eventually captured, however Sparkster saw a use for him and managed to save him from execution and pretty much made him her personal servant, he was literally forced to do ridiculous tasks that no one else would do, like get her dirty panties (She left them around everytime she changed them) off the floor and put them in the laundry cause she was to damn lazy to do it herself.

And if he didn't he'd be reduced to pile of jello via a bat with nails in it.

Despite all this abuse he decided to forgive her anyways, mostly because she saved his life somewhat and because he was a phathetic pink armored-rocket knight originally born to the Gearian amazon queen who had him abandoned on the side of road in a cardboard box as a baby and also because no matter what he did, he just coulden't get anything right, sure he was stronger than all of the other rocket knights including Sparks, but when it came to things like coming up with plans he was dumber than a freakin' rock, he needed some brains to make up for his loss.

Sparkster was those brains.

So ever since she was his new crush, she tolerated him better than Sherry, but then again it's hard to tolerate someone who has kidnapped you in the past. The fact Sparks showed enough compassion to save him from death showed she had some kind of interest in him (besides doing her dirty-work) and she proved it more when she allowed him to be second-in-command, leading when she wasen't around, she knew he was enslaved by them and forced to fight her against his own will and on top of that she knew if he was ever to turn against her once more, he'd be skinned alive by the other rocket knights.

Some time after the wars Sherry had decided to become a rocket knight, probably inspired by the one who saved her from Axle's clutches, she was soon followed by Cherry who also pursued the art of rocket knightry.

Later they heard that during the wars a new generation of opossum had been born to various rocket knight families, several of them where sent to Zebulos to be trained by Sparkster.

Over time they formed a group to protect Zebulos from the storm they knew would be soon to come, Sparkster herself saw General Fataissimo Lioness activate a personal teleportation device moments before the deathblow so she knew that the cat was still alive out there somewhere, somewhere being the cat capital, where Fataissimo was planning to completely take over and enslave the opossum race like they previously did to the lizards, wolves and pigs.

Unfortunatly the rocket knights did not know just what Fataissimo had in store for them...