With the water chip in her hand, she and her companions return to Vault 13. With the new device activated, the vault can go on with clean water and everything works out just fine for everyone.
...but can everything work out just fine? Not with those hulking green mutants around. Natalia is given a second task, this time to investigate the source of these mutants. This is for the good of the Vault; perhaps for the good of all the Wasteland.