The space-scape background appears to have been added in Australia. Earlier printings of this cover might exist.
Earlier printings of this story might exist. Other printings include: Magnum (Bladkompaniet AS, 1988 series) #3/1989 ([28. februar] 1989); Fantomet (Egmont Serieforlaget AS, 1998 series) #11-12/2010 ([25. mai] 2010); Delta 99 (IMDE, 1968 series) #1 (November 1968); Delta 99 (Ediciones Glénat, 2007 series) #nn (2007) [as Delta 99]; Dracula (Buru Lan, 1972 series) #25 (January 1974) [pages 1-20]; Dracula (Buru Lan, 1972 series) #26 (February 1974) [pages 21-24]; Magnum Comics (Pandora Press, 1988 series) #[nn] [1/1988] ([April] 1988).
Earlier printings of this story might exist. Other printings include: Delta 99 (IMDE, 1968 series) #2 (December 1968); Delta 99 (Ediciones Glénat, 2007 series) #nn (2007); Dracula (Buru Lan, 1972 series) #26 (February 1974) [pages 1-16]; Dracula (Buru Lan, 1972 series) #27 (March 1974) [pages 17-24]; Magnum (Bladkompaniet AS, 1988 series) #4/1989 ([mars] 1989); Magnum Comics (Pandora Press, 1988 series) #[nn] [2/1988] ([Maj] 1988)