These creatures were originally planned as a pre-form of Titanosaurus, before merging into a single, towering monster. To date, not much is known of the two Titans, except their origin as dinosaurs which miraculous escaped extinction, a back story that would still be utilized for Titanosaurus in the final version of Terror of Mechagodzilla (1975).

Note: No picture or concept art of the Titans exist, the above concept is Toho Kingdom's interpretation of the creatures, and not the original intent of Toho.