All Available Season All Season Specials Nov, 1983 21 episodes 0.0 Multiplication Rock Jan, 1973 11 episodes 9.5 Grammar Rock Sep, 1973 9 episodes 10.0 America Rock Sep, 1975 12 episodes 10.0 Science Rock Sep, 1978 9 episodes 9.3 Computer Rock Jan, 1985 4 episodes 10.0 Money Rock Sep, 1994 8 episodes 10.0 Earth Rock Oct, 2009 12 episodes 10.0
