Bruce Dickinson – lead vocals
Dave Murray – guitars, guitar synthesiser
Adrian Smith – guitars, guitar synthesiser, backing vocals, lead vocals on "Reach Out"
Steve Harris – bass, bass synthesiser
Nicko McBrain – drums

Martin "Masa" Birch – producer, engineer, mixing, tape operator
Bruce Buchhalter – second engineer
Sean Burrows – assistant engineer (Compass Point Studios)
Albert Boekholt – assistant engineer (Wisseloord Studios)
Ronald Prent – assistant engineer (Wisseloord Studios)
George Marino – mastering engineer
Derek Riggs – sleeve illustrations
Aaron Rapoport – photography
Rod Smallwood – management, sleeve concept
Andy Taylor – management
Hugh Gilmour – reissue design (1998 edition)