CREATE TABLE table_27998 ("Episode #" FLOAT, "The W\\u00f8rd" CLOB, "Guest" CLOB, "Introductory phrase" CLOB, "Original airdate" CLOB, "Production code" FLOAT)

Who were the guests in the episode with production code 6021?
SELECT "Guest" FROM table_27998 WHERE "Production code" = '6021'
SELECT "Guest" FROM "table_27998" WHERE "Production code" = '6021'