After reading Zone Fighter page again. Since it was confirmed to take place in Showa Continuity? My biggest question is why the Zone Family didn’t have even bother help Godzilla against Mechagodzilla (And Titanosaurus too later on) since the chaos by Mechagodzilla would be more enough to get the Zone Family’s attention and would probably make them step in and help Godzilla defeat Mechagodzilla? Is there explanation by Toho or any official material?
