Watch The Cosby Show Season 3 Episode 21 : I Know That You Know Online Streaming Site 123Movies

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Title	:	The Cosby Show
Genre	:	Comedy, Family
Air Date	:	1987-03-19
Season Number	:	3
Episodes Number	:	21
Overview	:	When Sondra and Elvin announce their engagement, Clair and the children use the news to play a practical joke on Cliff, who launches a counter-offensive of his own. Geoffrey Owens as Elvin.
Stars	:	Bill Cosby (Heathcliff Huxtable), , Phylicia Rashād (Clair Huxtable), , Malcolm-Jamal Warner (Theo Huxtable), , Tempestt Bledsoe (Vanessa Huxtable), , Lisa Bonet (Denise Huxtable), , Keshia Knight Pulliam (Rudy Huxtable), , Sabrina Le Beauf (Sondra Huxtable),

September 20, 1984 Season 1 24 Episodes September 26, 1985 Season 2 25 Episodes September 25, 1986 Season 3 25 Episodes September 24, 1987 Season 4 23 Episodes October 06, 1988 Season 5 25 Episodes September 21, 1989 Season 6 26 Episodes September 20, 1990 Season 7 25 Episodes September 19, 1991 Season 8 24 Episodes

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