Explorers Club was a progressive metal/rock supergroup headed by the Gardner brothers of Magellan featuring, among others, James LaBrie, John Petrucci of Dream Theater, and Derek Sherinian (then Dream Theater), D.C. Cooper (Royal Hunt), drummer Terry Bozzio, Billy Sheehan (bassist of UFO, Mr. Big and Steve Vai fame), James Murphy (from the metal scene) Their first album, Age of Impact was released in 1998, and Raising the Mammoth was released in 2002, to a slightly less favourable critical reception, notably due to the album's somewhat odd musical structure.