CREATE TABLE table_23548 ("#" CLOB, "Original title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original airdate" CLOB, "Production code" CLOB)

What was the production code for 'down to earth'?
SELECT "Production code" FROM table_23548 WHERE "Original title" = 'Down to Earth'
SELECT "Production code" FROM "table_23548" WHERE "Original title" = 'Down to Earth'