The significance of Frank being dressed in a rabbit costume rather than any other is no mistake. So Frank is solely responsible for using Donnie to resolve the fate of the real universe. It transpires that the jet engine got stuck between the real universe and the Tangent one, but it can only stay there for a short period of time (around 28 days) before it opens a black hole, destroying both universes. For example, Donnie’s sister’s boyfriend Frank keeps touching his eye (the one Donnie shot him in in the Tangent Universe).

The alternate timeline is solved, and Gretchen and Frank either wake up from bad dreams in the real universe or have some kind of inner understanding that their alternate fate has been resolved. Hence, him laughing in his bed as the jet engine crashes into his house, killing him in the process.

In that universe, we see the jet engine once again falling from the sky, and Donnie begins to understand that in order to save both Gretchen and Frank from their deaths, he must accept the fact that he has to die. However, the effect of Donnie living in the Tangent Universe is that he knows the world is going to end in just over 28 days, and it is up to him to figure out how to stop that from happening. A woman known as Grandma Death in the film explains that both Frank and Gretchen are the Manipulated Dead in the fictional book The Philosophy of Time Travel and belong to the alternate universe, having died. Donnie’s reaction is to shoot Frank in the eye, and he dies too. Oddly enough, though, we discover that Frank is actually Donnie’s older sister’s boyfriend, who later crashes his car into Gretchen, killing her in the process.

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