The Cosby Show 1984 | TV Show

Cast & Crew  |  Episode Guide

Cosby played a doctor and dad in this all-time classic, which was TV's biggest hit in the 1980s and almost single-handedly revived the sitcom genre and NBC's ratings fortunes after ABC passed on the series. Mostly set in a Brooklyn brownstone, the series f (more…)

Premiered: September 20, 1984

Rating: TV-G

User Rating:4.61 out of 5 (148 ratings)

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Season 3, Episode 21 I Know That You Know

First Aired: March 19, 1987

When Cliff brags he's too clever to be outsmarted, the family devises a joke to play on him. Phylicia Rashad. Sondra: Sabrina LeBeauf. Elvin: Geoffrey Owens. Rudy: Keshia Knight Pulliam.

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Previous Episode

Cliff's 50th Birthday

Season 3, Episode 20

March 12, 1987

Next Episode

Andalusian Flu

Season 3, Episode 22

April 2, 1987

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