Space Fantasy Zone is an unreleased CD-ROM² game developed by NEC Avenue under license from Sega. It attempts to bridge the gap between Fantasy Zone and Space Harrier, two games set in the same fictional universe of the "Fantasy Zone". It is a rail shooter similar to Space Harrier, but features Fantasy Zone's Opa Opa as the main character. Enemies are taken from both games and the music is a mix between the two as well. Also, there is a shop similar to the one in Fantasy Zone, and the introduction sequence bears a resemblance to Galaxy Force.