Yes. This IS a supplement for The Sponge Monkeys from Outer Space.
The Sponge Monkeys had their day in the sun. *sniff*
This supplement focuses on their arch-nemesi (we hope that's the plural form of nemesis) - the ninja kitties. More than that, Fun Pack #1 contains rules for generating your own ninja kitty character.
This includes MORE weapons, MORE gadgets, MORE gear, and, yes, more opportunities to roll the dice.
And if you buy this now, you'll get the free mini-adventure, "Yarn - the Unravelling? Don't let it happen!" Actually, even if you buy it later, you'll still get the mini adventure. That was just a marketing ploy. Sorry.