One version is common, at least one other version is rare
 Released later in the U.S. in 1991 as OVERLORD.
 Original design by David Perry & Nick Bruty; additional design support by David Bishop, Ian Mathias, Joe Bonar & John Martin. Coding by David Perry; additional coding and hardware support by Zareh Johannes (ZZKJ). Visual design and gfx by Nick Bruty; intro sequence by Paul Docherty (Dokk); gfx support and design by David Perry, Joe Bonar, Mark Knowles & Hugh Riley. Music and sound FX by Jeroen Tel.