Nintendo shows off "Diggernaut" boss battle and Omega Metroid for Metroid: Samus Returns

Nintendo showed off a Diggernaut boss battle in Metroid: Samus Returns. This is a brand-new boss battle that plays off the idea of the countdown element most Metroid games feature at some point. The Diggernaut seen above will chase Samus through a portion of the level, trying to crush her with a mechanical arm that grinds up the level behind her as she runs.

We also got a look at the Omega Metroid, which is another step in the Metroid evolution which we haven't seen before. Obviously, Samus will have to take on the Omega Metroid at some point.