CREATE TABLE table_29121 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Story by" TEXT, "Teleplay by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

Who wrote the story viewed by 0.53 million viewers?
SELECT "Story by" FROM table_29121 WHERE "U.S. viewers (millions)" = '0.53'
SELECT "Story by" FROM "table_29121" WHERE "U.S. viewers (millions)" = '0.53'