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For other characters in the Fallout universe named William, see William.
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William Ennis was an employee at the Sierra Madre.

His locker can be found at the Puesta del Sol switching station, unlocked by a key found near Christine Royce's position for the gala event. He is referred to as "old man Ennis" in a terminal entry in the same location. His locker contains a note titled toxic samples which suggests that Ennis was one of the workers in the hazard suits to protect the Sierra Madre against the Cloud.


William Ennis is mentioned only in the Fallout: New Vegas add-on Dead Money.