Fallout : Super mutants ending.The ending of Fallout, when you decide to join the mutant army and to reveal your old vault location. Somehow the Super Mutants 'evolved' or mutated even further and now they are not sterile anymore and have male and female genders and can reproduce naturally.
I can see Bethesda's trying to justify why there are Super Mutants in the future Fallout games (if they even give a shit about justifying anything in future games).
