John Lithgow - Dr. Dick Solomon

Kristen Johnston - Sally Solomon

French Stewart - Harry Solomon

Joseph Gordon-Levitt - Tommy Solomon

Simbi Khali - Nina Campbell

Elmarie Wendel - Mrs. Mamie Dubcek

Jane Curtin - Dr. Mary Margaret Albright

Wayne Knight - Officer Donald 'Don' Orville

Ian Lithgow - Leon

David DeLuise - Bug Pollone

Danielle Nicolet - Caryn

Chris Hogan - Aubrey Pitman

Ileen Getz - Judith Draper

A group of aliens have come to Earth to learn about its population, customs, etc. To avoid detection, they have taken on human form which gives them human emotions, physical needs etc. WITHOUT the understanding of what they mean or the inhibitions normally present in humans. Their leader takes the position of a college professor, their military expert as his sister, their intelligence expert, supposedly oldest of group takes form of his teenage son. The uninhibited reactions turn everyday events into unusual situations.