What was the title of the episode where reg lacey (aka mr. b) played the villain?
CREATE TABLE "table1_23170118_2" (
  "episode_number" text,
  "title" text,
  "villains" text,
  "director" text,
  "writer" text,
  "original_airdate" text
);
SELECT "title" FROM "table1_23170118_2" WHERE "villains"='Reg Lacey (AKA Mr. B)';