sentences:  Most did die, except for those specifically suited to survive in such an environment.The polymorphs evolved from these organisms.When it arrives on board the mining ship "Red Dwarf" in "Polymorph", the Polymorph attacks the crew by turning into a ruthless monster to drain Lister's fear, a beautiful woman to drain the Cat's ego, a duplicate of Rimmer to blame Kryten for the Cat's condition and thus extract his guilt, and Rimmer's mother after having sex with Lister to provoke Rimmer's rage.