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Basically, it all comes down to the creation and the destruction of the Tangent universes (TU). See, DD is meant to save the universe my sending the artifact back from the TU to the PU (primary universe). It is implied in the movie, when DD wakes up on the road at the beginning of the movie, when he looks at the sky and laughs, and when the class is reading the story "the destructors" (when DD gives his explanation that destruction brings creation, and that they just wanted to see what would happen when they tore the world apart, that he had undergone the experience of the TU before, but had failed to (Or by free will chose not to) send the artifact back to the PU, thus resetting the time loop. This would also explain why Frank is there to help DD, even though the Frank of that TU is still alive, he was killed in the previous TU. That is why DD implies he is a super hero, because he has figured out in previous TU's of his 4th dimensional powers, and although he might not consciously remember them, he subconsciously knows he does.. This also explains Why Mrs.Sparrow walks back and forth to and from her mailbox each day, awaiting the letter she has received from DD in TU's past