My Sister, Benedict Arnold
Season 3, Episode # 5
Number (#54) in series (117 episodes)
Network: ABC-TV
TV series:
Guest star(s) Gary Rist
Shari Cowart
Production code: 058
Writer(s) Elroy Schwartz
Director Hal Cooper
Original airdate 15 October 1971
Episode Guide
Episode chronology
« Previous
"The Wheeler-Dealer"
Next »
"The Personality Kid"

My Sister, Benedict Arnold is the fifth episode of Season 3 of the The Brady Bunch TV series, and the 54th overall episode of the series. Written by Elroy Schwartz, and directed by Hal Cooper, the episode premiered on ABC-TV, airing 15 October 1971.

Short Summary

Greg and Marcia use their dates to get back at each other, and the younger Brady siblings prepare for the school carnival by building a dunking tank.


Marcia is excited that a high school boy has asked her out on a date. Marcia tells Greg about the date and wants his opinion about the boy. Without yet telling him who the boy is, Greg tells her that the only boy who he would object to is his school rival, Warren Mullaney. Marcia's date happens to be with Warren, but based on Greg's comments, she figures that she will still go out with him since it is solely Greg who has a gripe with Warren. She however plans on not telling Greg. Greg does find out that Warren is Marcia's date, and he forbids Marcia from ever going on a date with him again.

Although she was never planning on going out with Warren again because there was no "spark" between them, she decides to ask him out again solely to spite Greg. However Greg brings home Marcia's rival, Kathy Lawrence. Marcia and Greg clash over this and Mike admonishes them for using Kathy and Warren to make a point. They go to the other room to apologize, but return to find that Warren and Kathy have befriended each other and left together.

Meanwhile, the other kids are all excited by the upcoming junior high carnival. Alice, Peter, Cindy and Bobby work on a dunking machine.

Guest starring/Recurring cast

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.