It's hard to believe that LEGO Atlantis is likely entering into it's final lap soon (I mean they do find the Temple of Atlantis in 2011, after all). The 'villian' minifigs from this series have a been both unique and inspired.
Numbers:123456789 placed a couple of pics up on his Flickr stream earlier today showing off a couple of figures from the Temple of Atlantis set. As you can clearly see the helmet of the Series 2 Spartan has returned, this time completely in pearl gold. Although not shown here, the head is reversible so you can present a gold face or a man's face if you so choose.
Numbers also has some good pics of the Crab Monster in its full crustacious glory. Check them all out on his Flickr stream.