Flash (1987) 166-A

"Wonderland, Part 3 of 6: The Broken Looking Glass"

*Wally and Captain Cold try and reason with Barry Allen and the rest of the Keystone police force, but fail. Their conversation is cut short by the arrival of the Mirror Master, who explains that he's trapped in this dimension along with them. A mysterious white-haired person tricked Cold and Mirror Master into luring West into this world, but they got sucked in too, and Mirror Master's mirror gun broke in transit. He explains that they need to get the gun fixed and escape as soon as possible or their presence will cause this reality to collapse in on itself. Somehow, this reality's Thinker has also deduced that he is in an unreal world, and wants to escape, using Wally and the Rogues to do so.

When the three 'real world' people arrive at the Hal Jordan museum, they are attacked by Plunder, whose lasers overload and activate Mirror Master's newly repaired gun, causing their reflections to come alive. And the reflections don't look friendly... *Source: dcuguide.com