Flash Gordon's Trip to Mars

In the stock footage from Flash Gordon (1936), shown in this film, as Flash is telling The Clay People about his previous encounter with Emperor Ming, Ming is bald and Dale Arden has blond hair. In this sequel, Ming has "pasted on" hair and Dale is a brunette. It has been reported that Jean Rogers (Dale Arden) had many other film roles pending at that time (1938) that called for her to be a brunette.

This movie picks up the action from Flash Gordon (1936) as they return to Earth from Mongo (ie: They are still returning from Mongo). At the end of that first movie, they took off for Earth in Zarkov's Space ship but they are now in a Mango Space Ship (with the nose ray gun). The cliffhanger of Chapter 1 has one of the engines shot off the ship and at the start of Chapter 2 (after the cliffhanger resolution) Ming looks at the engine and says "It is from the ship they stole from me".

Edited into Mars Attacks the World (1938)