Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Flash Gordon: The Greatest Adventure of All is a 1982 animated television film produced by Filmation and written by Samuel A. Peeples, whose credits included the original Star Trek series. It is the time of World War II, Flash Gordon is on a mission in Warsaw which is suffering heavy bombing. He arrives too late and his contact is near death. He has a message for Doctor Zarkov, one word "Mongo" before he dies.