Who was the challenger on Episode 5?
CREATE TABLE "1993" (
  "overall_episode_num" real,
  "original_airdate" text,
  "iron_chef" text,
  "challenger" text,
  "challenger_specialty" text,
  "theme_ingredient" text,
  "winner" text
);
SELECT "challenger" FROM "1993" WHERE "overall_episode_num"=5;