CREATE TABLE table_73972 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Patient Portrayer" TEXT, "Original air date" TEXT, "Production code" FLOAT)

Who wrote episode number 28?
SELECT "Written by" FROM table_73972 WHERE "No." = '28'
SELECT "Written by" FROM "table_73972" WHERE "No." = '28'