CREATE TABLE table_30681 ("No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( million ) " CLOB)

Who directed the episode titled 'Playing the Cancer Car'?
SELECT "Directed by" FROM table_30681 WHERE "Title" = 'Playing the Cancer Car'
SELECT "Directed by" FROM "table_30681" WHERE "Title" = 'Playing the Cancer Car'