Assertion: jack | /r/CapableOf | become mortal
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Source sentences:
text: The fourth series, Miracle Day (2011), an American co-production, sees Jack return to Earth to investigate a phenomenon where humans can no longer die; Jack discovers that he has become mortal.
text: As a consequence of his death and resurrection in the Series 1 finale, "The Parting of the Ways", Jack becomes immortal and is stranded on 19th-century Earth.
text: In relationship to Miracle Day, where Jack becomes mortal, critics approached Barrowman and Davies about the implications of such a move for Jack's potential future as the Face of Boe.