What is the rank for the episode that premiered on September 13, 1978?
CREATE TABLE table_name_21 (rank VARCHAR, premiere VARCHAR)
SELECT rank FROM table_name_21 WHERE premiere = "september 13, 1978"
### Context: CREATE TABLE table_name_21 (rank VARCHAR, premiere VARCHAR) ### Question: What is the rank for the episode that premiered on September 13, 1978? ### Answer: SELECT rank FROM table_name_21 WHERE premiere = "september 13, 1978"