sentences:  In one episode he sees a man in a nightclub wearing a Nirvana T-shirt, in several early episodes he sees the face of George W. Bush on the front page of the newspaper, and he frequently sees Mars rover robots following him or attempting to enter his body.At other times, he also hints at his knowledge of the future to his colleagues; in a discussion of then-President Richard Nixon he confuses them by asserting that Nixon won't be in office much longer, he makes a veiled allusion to the September 11 attacks when advising them against engaging in hate speech, and he uses then-future cultural references as undercover pseudonyms — sometimes giving his name as "Luke Skywalker", "Tom Cruise" or "Sam Bono", and giving Gene and a female companion the undercover names "George and Laura Bush".At the end of the series, it is revealed that Tyler's 2008 and 1973 realities were "both" fictitious, created by the onboard computer of a spacecraft that is carrying Tyler, Hunt, Norris, Carling, and Skelton on the first ever manned mission to the planet Mars, in 2035.