CREATE TABLE table_55368 ("Title" CLOB, "Original story author" CLOB, "Director" CLOB, "Original U.S. air-date" CLOB, "Original Canadian air-date" CLOB)

What was the Original Canadian air-date for the episode directed by mark rydell?
SELECT "Original Canadian air-date" FROM table_55368 WHERE "Director" = 'mark rydell'
SELECT "Original Canadian air-date" FROM "table_55368" WHERE "Director" = 'mark rydell'