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Appearances
Think of a Number
Main cast, played by Johnny Ball
- Episode 1x01: Materials (Apr 12, 1979)
- Episode 1x02: Water (Apr 19, 1979)
- Episode 1x03: The Shape of Wealth (Apr 26, 1979)
- Episode 1x04: Episode 4 (May 3, 1979)
- Episode 1x05: Episode 5 (May 10, 1979)
- Episode 1x06: Episode 6 (May 17, 1979)
- Episode 2x01: Episode 1 (Sep 12, 1979)
- Episode 2x02: Episode 2 (Sep 19, 1979)
- Episode 2x03: Episode 3 (Sep 26, 1979)
- Episode 2x04: Episode 4 (Oct 3, 1979)
- Episode 2x05: Episode 5 (Oct 10, 1979)
- Episode 2x06: Episode 6 (Oct 17, 1979)
- Episode 3x01: Episode 1 (Sep 10, 1980)
- Episode 3x02: Episode 2 (Sep 17, 1980)
- Episode 3x03: Episode 3 (Sep 24, 1980)
- Episode 3x04: Episode 4 (Oct 1, 1980)
- Episode 3x05: Episode 5 (Oct 8, 1980)
- Episode 3x06: Episode 6 (Oct 15, 1980)
- Episode 4x01: Episode 1 (Sep 15, 1982)
- Episode 4x02: Episode 2 (Sep 22, 1982)
- Episode 4x03: Episode 3 (Sep 29, 1982)
- Episode 4x04: Episode 4 (Oct 6, 1982)
- Episode 4x05: Episode 5 (Oct 13, 1982)
- Episode 4x06: Episode 6 (Oct 20, 1982)
- Episode 5x01: Episode 1 (Jan 4, 1984)
- Episode 5x02: Episode 2 (Jan 11, 1984)
- Episode 5x03: Episode 3 (Jan 18, 1984)
- Episode 5x04: Episode 4. (Jan 25, 1984)
- Episode 5x05: Episode 5 (Feb 1, 1984)
- Episode 5x06: Episode 6 (Feb 8, 1984)
- Episode 6x01: Episode 1 (Sep 26, 1984)
- Episode 6x02: Episode 2 (Oct 3, 1984)
- Episode 6x03: Episode 3 (Oct 10, 1984)
- Episode 6x04: Episode 4 (Oct 17, 1984)
- Episode 6x05: Episode 5 (Oct 24, 1984)
- Episode 6x06: Episode 6 (Oct 31, 1984)