"As many intelligent people know, aliens are all around us. This is a story of a band of four such explorers. In order to blend in, they have assumed human form. This is the High Commander [d**k]. He has assembled an elite team of experts: A decorated military officer [Sally], a seasoned intelligence specialist [Tommy] and [Harry], well, they had an extra seat."
For more about the show and video clips:
http://www.tv.com/3rd-rock-from-the-sun/show/181/summary.html?full_summary=1
