Series one consists of the following characters: Yog-Sothoth, Dagon, Star-Spawn, The Hound, Nyarlathotep, and H.P. Lovecraft himself.
The were initially released in the classic MUSCLE flesh/pink color, which was followed up by a multi-color release consisting of green, blue, red, orange, purple, and pink/salmon. They are sold in carded 3-packs that each contain a set assortment of characters (packs A and B, which can each be purchased alone or together).
These figures are amazing! They're some of my favorite recent additions to my collection.
You can learn more and purchase them at mythosinmypocket.com.