My absolute favorite section of the DCC RPG core book was the section "The Great Wheel", bullet point one, where the author recommends: "the judge is encouraged to begin extraplanar encounters at low levels." I'm relatively sure that there was a great rift in my brain, as the right brain judiciously buckled up and marched itself into a corner, complaining that this was totally impossible, as the left side bulged, enlightened finally.
I cannot recall how many times I looked over D&D sourcebooks regarding the planes, where there were these colossal enemies that would require a party of level 20+ to tackle, and while I would be incredibly interested in running such a campaign, I always just told myself, "one day my players will get there!" This just reminded me of the potential for fun I see in the simplicity and (current) cohesiveness of the DCC RPG core.
Needless to say, these words will be on my mind heavily in the building of 0-level adventures. I'm already marinating in ideas which are building themselves as I try to focus on other tasks!
SIDE NOTE - STOP TRASHING GOBLIN RAIDERS AND ORCS
Unfortunately, storytellers and game masters have unrightfully abused these characters as throwaway nobodies of no zero consequence. The mentality has always been '4 orcs, no name, and a chieftan, with a silly name, and you can increase your players by 1 level!' I recently read Goodman Games 'Monstercology of Orcs' by Maffei, and there was such an abundance of story inspiration in there, it would be so silly to write off orcs like they are yesterday's game. Yeah, you've seen orcs in caves, you've heard of orcs as savages, orcs being manipulated by a wizard, but what exposure has anyone had to the actual culture of orcs? Depending on which creation myth you choose for orcs, there are countless scenarios which could prove truly epic for a 0-10 campaign. Variations on orcs provided in said text were enough to get me considering that possibility. Especially since it appears based on the occupation list that DCC/Aereth has fully civilized all the demi-humans and humans (no human tribes, for example), the orcs are one of the last scraps of tribal organizations similar to that of humans of hundreds of years ago on the planet!