CREATE TABLE table_653 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

Who is the writer of the episode called 'Ambush' (part 1)?
SELECT "Written by" FROM table_653 WHERE "Title" = 'Ambush" (Part 1)'
SELECT "Written by" FROM "table_653" WHERE "Title" = 'Ambush" (Part 1)'