He describes Laurie as his only remaining link to humanity. This is demonstrated when the relationship ends, and Doctor Manhattan leaves Earth. This is also due to evidence coming to light that a number of those who were once close to him, including his former girlfriend Janey Slater, have come down with terminal cancer. Manhattan feels that he poses a threat to others, and he exiles himself to Mars, stating "I am tired of Earth, these people. I'm tired of being caught in the tangle of their lives." His interest in humanity is revived after he witnesses Laurie's epiphany that she is the daughter of the Comedian. It causes him to reflect on the sheer chance that life should come to be in any form, but after the Watchmen fail to prevent Ozymandias's destruction of New York, he departs Earth, commenting that he may explore new life in other parts of the galaxy.