The Scramble Dash was a Great Mazinger accessory sold separately that would allow wings to be affixed to the back of Great Mazinger via a waist clip. The wings and fin attach to a small backpack. Unlike the Jet Scrander, which was a separate vehicle that would join-up with Mazinger Z, the Scramble Dash was incorporated into Great Mazinger's design - the wings and fin would project from his back to allow him to fly greater distances and with more maneuverability.
Thematically Great Mazinger is more of a Jet-age construct while Mazinger Z is a bit more primitive. I guess that makes sense as Great Mazinger was designed to replace Mazinger Z, just like Mazinkaiser in turn replaces Great Mazinger with more size, strength and firepower.
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