Question: What's the number of the episode seen by 2.24 million people in the US?
SQL: SELECT "#" FROM "1-21696800-1" WHERE "U.S. viewers (million)" = '2.24';

Question: How many millions of people in the US saw the episode titled "Rabid"?
SQL: SELECT "U.S. viewers (million)" FROM "1-21696800-1" WHERE "Title" = '"Rabid"';

Question: How many different episode numbers are there for episodes directed by Wayne Rose?
SQL: SELECT COUNT("#") FROM "1-21696800-1" WHERE "Directed by" = 'Wayne Rose';

Question: How many millions of people in the US saw the episode titled "Kandor"?
SQL: SELECT "U.S. viewers (million)" FROM "1-21696800-1" WHERE "Title" = '"Kandor"';