Dark Adventure Radio Theatre: Masks of Nyarlathotep is an epic tale of globe-trotting adventure inspired by the works of H.P. Lovecraft, presented as a 1930s-style radio drama. Dark Adventure Radio Theatre presents the tale with an absurdly large cast of professional actors, exciting sound effects and thrilling original music by Troy Sterling Nies.
A variety of system-agnostic, game-related products are available; they contain props and artifacts useful in any Cthulhu style campaign. Note there is considerable overlap in some of the box set contents.