I was wondering if Ed Mitchell was the only astronaut to sing of aliens and cover-ups, so I dug around a little and found some pretty interesting stuff.
Some alleged transcripts from several Apollo missions are rife with UFO and alien references. Like this one from Apollo 11, which was supposedly picked up by ham radio operators:
Now sure, that sounds about as convincing as Ricky Martin telling Barbara Walters he's not gay, but it's pretty damn cool anywho.
Armstrong: What was it? What the hell was it? That's all I want to know!"
MissionControl: "What's there?... malfunction (garble) ... Mission Control calling Apollo 11 ..."
Apollo 11: "These babies were huge, sir!... Enormous!... Oh, God! You wouldn't believe it! ... I'm telling you there are other space-craft out there ... lined up on the far side of the crater edge! ... They're on the Moon watching us!"
There's also Gordon Cooper, who set an endurance record on Gemini 5. He was quoted as telling a United Nations panel in 1985,
There's also Dr. Story Musgrave who supposedly flew on six missions and during one saw a saucer shaped craft behind the shuttle. He doesn't have any evidence, but he did try to communicate telepathically with aliens on each mission.
"I believe that these extraterrestrial vehicles and their crews are visiting this planet from other planets, which obviously are a little more technically advanced than we are here on Earth."
I'll keep on looking. If there is any truth to this there have to be other astronauts who have let something slip.