Crisis On Infinite Earths #8 Facsimile Blank Variant

The vibrations that were threatening to destroy the five remaining Earths have ceased with the destruction of the Anti-Monitor’s machinery in the Anti-Matter universe, but the Anti-Monitor himself has escaped. In all the universes he has conquered, he has never found himself so opposed. In order to destroy the five remaining universes, he has constructed a massive anti-matter cannon.The only hero who knows of this development is Barry Allen, the Flash of Earth 1. But as a captive of the Anti-Monitor, is there anything he can do to prevent this new plan from succeeding?