Supergirl (2005) #56
an issue of Supergirl (2005) by DC Comics
Issue description
Just as Supergirl was getting used to being on Earth again, it's back to the stars as Bizarro Supergirl drags the Girl of Steel to Bizarro World! But when the pair discovers a monstrous threat to the square planet's existence, will they be able to save the day? And now that the threat has seen Supergirl, how soon until Earth is its next target?