Dark Samus, an obviously evil version of Samus.

yet it feels like a bad version of Prime 1 at the same time

Samus encounters a dark version of herself and before she can attack she is sent back to the light side of the world

Many creatures dwarf Samus and like the worlds, there are dark versions of most enemies

In the dark twisted version of Aether, known as Dark Aether (That is one of the most creative titles I've ever heard) the parasitic spiderish like Ing rule

Who doesn't love a fight with the dark version of yourself

You get to battle a dark version of Samus throughout and also traverse giant mechanical fortresses

fans of Prime will love Echoes, just as i do.there are still numerous things to scan and you are awarded with nifty and interesting bonuses and secrets depending on how much you get scanned.