Alien-Vampire hybrids are actually possible..
DISCLAIMER: this is not officially supported, attempt at your own risk, while I'm not certain it COULD corrupt your save game Looks like when we were told there were no hybrids, it wasn't completel...
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Hybrid aliens ( or at least mine) that are turned into vampires still have all alien interactions (like secret alien handshake) and vampire powers. I'm not sure if this is a bug or not but at least your game won't crash most likely:)
