|Neil Spicer RPG Superstar 2009, RPG Superstar Judgernaut, Contributor|
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There are multiple ways to introduce the alien PCs into the same homeworld as traditional PCs. Any of the following would work:
Amnesia: As suggested, you could have the aliens suffering some kind of temporary memory loss...whether as part of a normal affliction/illness or some kind of magical curse or technological treatment.
Stranded: As recent arrivers, they could have been stranded there through a freak accident while activating a gate or other technology on their own homeworld. Of course, you have to be careful if you go this route, because if these alien PCs already know a lot about the greater multiverse and interplanetary travel, it could give them more insight into the Adventure Path's backstory than you might want to reveal from the get-go. Of course, on the flip side, having them know more about the looming threat might give a greater catalyst for roleplay and getting more traditional PCs involved in the overall plot.
Abducted: Although there are abduction themes firmly laid into To Worlds Unknown and the start of the AP, there could have been a reverse abduction that brought alien PCs to the traditional PCs' homeworld.
Colonials: These alien PCs could have legitimately traveled to the traditional PCs' homeworld, part of exploration meant to establish their own colony there. Of course, the fate of that colony might be in jeopardy such that the alien PCs now represent the last of their kind and they'd very much like to return to their culture if they could.
Transmutation: Perhaps the alien PCs were once from the same species as the traditional PCs, but powerful transmutation magic warped them into what they are now...never realizing that their new forms are also the same seed stock the Ancients used to seed other worlds across the stars.
Reincarnation: In a similar fashion, reincarnation could have resulted in members of the native species on the PCs' homeworld returning to life as members of these alien species, never realizing there are more of their kind on other worlds.
Hybrids: Perhaps these alien PCs represent a hybrid race, a mingling of DNA from the species of the traditional PCs' homeworld and something else. The end result is something "in between" the two species, kind of in the same fashion as how half-elves and half-orcs are possible. The "alien" PCs may have never known their off-world parents and lack knowledge of their homeworld as a result.
Just a few ideas,