Once apon a time there was an astronaut named John Cricton. John comes to a halt as Crais and the PK run onto the stage in formation. They are all lined up neatly, he is in front.
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And he also accidently irreversably contamined a PK pilot named Aeryn Sun. Cause there's a chance the PK want you dead. They got away, thanks to John's experiment, and he and Aeryn went with them. But they still the PK to worry about, and they all wanted to go home, even though home was a different place for each of them.