Flash Gordon (1980)

Revealing mistake: When Biro stabs the Imperial soldier with his sword, it's obvious that the sword is angled to miss his body. (01:30:50)

Dr. Hans Zarkov: We are only interested in friendship. Why do you attack us?
The Emperor Ming: Why not? Pathetic earthlings. Hurling your bodies out into the void, without the slightest inkling of who or what is out here. If you had known anything about the true nature of the universe, anything at all, you would've hidden from it in terror.

Trivia: The soundtrack for this film was largely composed and performed by the British rock group Queen. Howard Blake created the original score and some parts remain in the film.

megamii

Question: What exactly was the enormous creature that came out of the ground and attacked Flash in the forest?