Worlds' Finest (Renaissance), book 1: The Lost Daughters of Earth 2
Paul Levitz et Collectif2013

On the parallel world of Earth 2, humanity's greatest heroes fell to the invading hordes of the planet Apokolips. During the battle, Batman's daughter and Superman's cousin-Robin and Supergirl-were flung to our world.

They discover our Earth is eerily similar to the one they left, but at the same time unfamiliar, dangerous and different.

After five long years, the duo is still marooned in a strange land, but under new identities. As the urban vigilante Huntress, Helena travels the world doling out nocturnal justice under a series of changing secret identities, while Karen Starr takes to the skies as the high-flying Power Girl.

The two friends protect this world like it's their own, but it will never be their home. Will the World's Finest ever find their way back to Earth 2?
(Collects World's Finest #0-5)