A former NASA engineer claims he saw a nine-foot alien while monitoring a space mission in 1991 . Clark McClelland was allegedly part of a team based at the Kennedy Space Center in Cape Canaveral , Florida , when he spotted the extra-terrestrial humanoid . The 'entity ' , he says , stood on two legs and approached two U.S. astronauts , that he would not name , for one minute and seven seconds in the space shuttle bay . SCROLL DOWN FOR VIDEO . Sighting ? Clark McClelland , allegedly pictured during his time with NASA , claims he saw a nine-foot alien . The entity , he claims in a YouTube video , was standing on two legs and interacted with two US astronauts . His story has been hailed by supporters as the most conclusive evidence that intelligent life exists in space . McClelland claims the U.S. government has stripped him of his pension and forced him to live on social security , despite insisting he has served on more than 800 NASA missions . But in a series of YouTube videos , he implores the public to take him seriously . ' I love my planet , I love our human race . I 'm trying to serve all of you , if only you will let me , ' he tells viewers . Video : Stargate Chronicles . Getting his story out : McClelland has posted pictures from his time with NASA but claims nobody believes him . History : This is allegedly a picture of McClelland ( left ) with Judy Resnick ( right ) , America 's second female astronaut who died in 1986 when her Challenger shuttle broke apart 73 seconds into flight . After more than 800 missions with NASA , he says , he has no pension and lives off social security . McClelland 's Twitter profile features a picture billed as his younger self in NASA uniform . In a picture on his website he poses with NASA astronauts by a space shuttle . Another shows a beaming McClelland allegedly stood with Judy Resnick , America 's second female astronaut who died in 1986 when her Challenger shuttle broke apart 73 seconds into flight .
Clark McClelland was 'part of more than 800 missions with NASA ' He claims he was watching one 1991 mission when he saw a 9ft entity . The 'humanoid ' interacted with two America astronauts for a minute , he says .