The Cat Arks were two shuttles built (or modified from existing shuttles) aboard the massive spacecraft Red Dwarf by the Felis sapiens who had evolved on the ship from their progenitor Frankenstein three million years earlier. Almost the whole species left Red Dwarf aboard the Cat Arks, a decade or so before the last human, Dave Lister, came out of stasis. Lister emerged to find only one of them (and an old blind Cat Priest) still aboard Red Dwarf.