 During the big 4 monster attack on Tokyo (by Godzilla, Rodan, Manda  & Mothra) there was a few minutes of footage shot of Godzilla and  manda fighting. It was later decided that it was out of character  for the monsters to start fighting, as they were under the Kilak  control. The scene was immediately scrapped. It has been rumored  that the scene was shot on the spur of the moment, ...that the fx  people were having a bit of fun (having Manda attack Godzilla) 