How many million U.S. viewers was written by Matt Pelfrey?
CREATE TABLE "table1_29545336_2" (
  "no" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "featured_character_s" text,
  "u_s_viewers_millions" text,
  "original_air_date" text
);
SELECT "u_s_viewers_millions" FROM "table1_29545336_2" WHERE "written_by"='Matt Pelfrey';