What type of ending is this?

Superman suddenly flies around the earth so fast that he turns back time so Lois Lane doesn't die. Is it Flat, Random or Obvious?

After fighting aliens for the whole movie, the main characters find out the aliens can be defeated by ... water. Is it Flat, Random or Obvious?

After fighting the Russians for control of the crystal skull for the whole movie, it is suddenly revealed it belongs to ... aliens. Flat, Random, or Obvious?

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