Twenty years after the US Air Force first started investigating UFOs, a selection of scientists and eyewitnesses are interviewed by ITV's World in Action team.
| Actor | Role |
|---|---|
| EEdward CondonNot listed | Not listed |
| RRex HeflinNot listed | Not listed |
 J. Allen HynekNot listed | Not listed |
| JJames McDonaldNot listed | Not listed |
| DDonald MenzelNot listed | Not listed |