The Un-Underground Movie is the fourth episode of Season 2 of The Brady Bunch, and the 29th overall episode in the series. Written by Albert E. Lewin and directed by Jack Arnold, it first aired 16 October 1970 on ABC.
For an American history class project, Greg enlists his family to create a documentary about the first Thanksgiving.
Greg is excited that his history teacher wants his class to do creative projects on the colonies. Seeing his father's movie camera, Greg decides he wants to make a movie depicting the pilgrims. It becomes a family project including his family being the cast. Some of the help Greg appreciates, while some of it not. To regain control, Greg, the director, gives his family an ultimatum: do it his way or the movie's off. This ultimatum makes them realize that this project indeed should be Greg's. Will filming go more smoothly than pre-production?