The unusual nature of this documentary has led some to speculate that it was produced to 'test the waters' to gauge how people would respond to the idea of alien contact.
By all accounts, the special only aired one time, and even then it was broadcast in only five cities. The special is not currently available on video or DVD but luckily, someone managed to tape a copy on VHS when it was originally broadcast. Thanks to the wonders of the Internet and YouTube, if you missed the original airing, you can now view the entire documentary:
"Mankind is in the midst of the most profound event in history – actual contact with intelligent life from other planets. For nearly 50 years, officials have been documenting routine alien encounters here on earth, and thousands of people have seen or experienced this alien presence. Yet many others still refuse to acknowledge the obvious evidence all around them. From beyond the boundaries of our perceptions, intelligent beings are beckoning mankind to join the galactic community."
From the Walt Disney Special 'Alien Encounters'.