Atragon is a favorite film of mine: great mecha special effects, an underwater dragon, and interesting characters (yes, you can post pictures of figures of the Empress of Mu as well!!).
First up, the Atragon and Manda combo set from M1Go, released at the Tokyo WonderFest 2/24/2008.
This release of Manda was unique as M1 added a few body segments to their previous version which allowed Manda to better wrap around the Atragon submarine.