The first demo scene release "Doomsday" for Xbox was introduced at the Assembly 2003 demo / LAN-party in the finland during the weekend by the legendary demo group "Complex" (active since 1989 website at http://www.komplex.org), not the new group with the same name that released some of the Xbox warez and hacks lately.

Assembly (http://www.assembly.org) has been the most significant demo scene event since 1992 and it's organized annually in Helsinki, the capital of Finland.