All 13 episodes from the fourth season of Sam Esmail's crime drama starring Rami Malek as the troubled hacker Elliot Alderson. In this season, Elliot's life is threatened and the identity of an infamous cyber-terrorist is revealed. The episodes are: '401 Unauthorized', '402 Payment Required', '403 Forbidden', '404 Not Found', '405 Method Not Allowed', '406 Not Acceptable', '407 Proxy Authentication Required', '408 Request Timeout', '409 Conflict', '410 Gone', 'eXit', 'whoami' and 'Hello, Elliot'.