Power Girl
This separation between the pre-"Crisis" Earth-Two and post-"Crisis" Earth-2 is formally established in "Justice Society of America Annual" #1 (2008), with a story titled "Earth 2 Chapter One: Golden Age", in which the New Earth Power Girl arrives on post-"Crisis" Earth-2. Thinking that she has returned home to her long destroyed pre-"Crisis" Earth-Two. Power Girl crash lands and unconscious, on the closest parallel of the 52 Multiverse, the post-"Crisis" Earth-2, which appears similar to the pre-"Crisis" Earth-Two. She is found by the post-"Crisis" Earth-2 Huntress, who thinks she is her long-missing best friend, the Power Girl native to this world. In this new reality, the Justice Society of America has merged with Infinity, Inc. and is now known as Justice Society Infinity. Initially, Power Girl believes she has returned home, until the missing post-"Crisis" Earth-2 Power Girl reappears and declares that the other Power Girl is an impostor, and has caused the disappearance of the post-"Crisis" Earth-2 Superman. This turn of events results in the post-"Crisis" Earth-2 Power Girl and the Justice Society Infinity to go after the New Earth Power Girl.