 He told a reluctant Alpert if he was suspicious of Locke's claims of time travel, Alpert should visit Locke's birthplace in two years for proof.Locke was unable to convince Alpert to tell him how to leave the island before another time skip occurs.Alpert took Locke's advice and visited the newborn Locke two years later on May 30, 1956 in the episode "Cabin Fever".