The Cosby Show I Know That You Know (Season 3, Episode 21)
TV-PG
TV Episode | 22 min | Comedy, Family, Romance

The Cosby Show

I Know That You Know (Season 3, Episode 21)

TV-PG

TV Episode | 22 min | Comedy, Family, Romance

Sondra and Elvin announce their engagement. Since Cliff always says he knows everything that goes on, Clair and the kids decide to play a joke on Cliff about the engagement. He finds out before the joke and turns the tables on the others.

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Cast	+ Add Cast
8 cast members

Name	Known for
Bill Cosby Dr. Heathcliff 'Cliff' Huxtable Dr. Heathcliff 'Cliff' Huxtable See fewer	The Cosby Show (1984)
Phylicia Rashad Clair Huxtable Clair Huxtable See fewer	The Cosby Show (1984)
Sabrina Le Beauf Sondra Huxtable Tibideaux Sondra Huxtable Tibideaux See fewer	The Cosby Show (1984)
Lisa Bonet Denise Huxtable (credit only) Denise Huxtable (credit only) See fewer	Angel Heart (1987)
Malcolm-Jamal Warner Theo Huxtable Theo Huxtable See fewer	The Cosby Show (1984)
Tempestt Bledsoe Vanessa Huxtable Vanessa Huxtable See fewer	The Cosby Show (1984)
Keshia Knight Pulliam Rudy Huxtable Rudy Huxtable See fewer	The Cosby Show (1984)
Geoffrey Owens Elvin Tibideaux Elvin Tibideaux See fewer	The Cosby Show (1984)