The Sentry then flies off and meets up with Doctor Strange. Doctor Strange uses his magic to peer into Sentry's memories and his life force. Doctor Strange finds that Sentry's life force is incomplete. While Strange and Sentry dialogue, a third voice can be heard speaking – though only the Sentry can hear it. The third voice tells Sentry that he is not real, and that he does not exist. Doctor Strange, oblivious to the third voice, peers deeper into the Sentry's memories, and reveals that even the Sentry's own understanding of his origins are flawed. Doctor Strange finally uncovers a deep memory of a secret fortress-like building, that Sentry recognizes as the Professor's base of operations. Doctor Strange, suddenly overcome by panic and fear, shuts down the magic mind probe and begs the Sentry not to pursue this any further.