The Archa Seven arachnid is a kind of organic alien living on Archa VII, which Optimus, Sentinel and Elita-1 visited. The scientific or regular name for these creatures is unknown. However, they are seemingly very dangerous and, for some reason, their eggs look like spherical Energon. The Archa Seven arachnid is also the cause of Sentinel Prime's Organic-phobia and his hatred for Optimus Prime.