The Monsters

Sonic was a business name of Sega S.A. (aka Segasa). The company was founded by Martin Bromley and Bert Siegel in 1968 as a means of producing arcade machines for the Spanish market. Despite sharing a similar name and being associated with Sega executives, Segasa is not thought to have ever been a subsidiary of Sega in Japan or the US, but is thought to have manufactured and distributed Sega's products, with Japanese designs but with parts sourced from Europe. It also exported its own games, which may have been distributed by Sega in other regions.

In the mid-1970s, likely in conjunction with Sega changing its corporate logo, Segasa began trading as Sonic(years before the invention of Sega's mascot, Sonic the Hedgehog), sometimes under the full title of Segasa d.b.a. Sonic (doing business as).