The MSZ-006 Ζ Plus (Zeta Plus) mobile suit series is a series of mobile suits developed by the Earth Federation and Anaheim Electronics in the Universal Century calendar of the anime series Gundam. All of the Ζ Plus designs are by Katoki Hajime and Masahiki Asano based on the MSZ-006 Ζ Gundam, designed by Kazumi Fujita with transformation designed by Kunio Okawara and later redesigned to closer resemeble the Z Plus series by Katoki Hajime in various model kits and figures, which was a ground-breaking, revolutionary, and powerful mobile suit. However, the Ζ Gundam was also a painfully complicated and expensive mobile suit and the Earth Federation did not want to mass-produce it as it is. After the Gryps Conflict ended the Earth Federation wanted the design of the Ζ Gundam to be reworked, so that it was more streamlined, less complex, and, most importantly, cheaper to manufacture, but so that it would still retain all of the major strengths of the original unit. The Ζ Plus line of mobile suits was the answer to the Federation's requests. The MSZ-006A1 (MSK-006) Ζ Plus A1 was the first Ζ Plus unit created. The Ζ Plus A1 was designed to operate mainly in Earth's atmosphere. It was a high-performance unit and was capable of transformation from a mobile suit into a jet-like waverider mode. It started the trend of adding on two swiveling beam cannons on the mobile suits hips which would be included in almost all of the later Ζ Plus designs. The Ζ Plus A1 also included the standard armaments of a hand-held beam rifle, two beam sabers, and twin 60 mm vulcans in the head. There were two color schemes of the Ζ Plus A1. The main color scheme was a neutral light gray and blue, however there was also a unit which featured a rusty orange and white color scheme and an "A" emblem on its left shoulder, the personal insignia of Amuro Ray. This orange Ζ Plus A1 was rumored to have been piloted by ace pilot Amuro Ray. It was never confirmed whether Amuro Ray actually test-piloted the Ζ Plus A1, and the rumor may have just been a marketing scheme concocted by Anaheim Elctronics to get the Federation more interested in the unit to drum up sales. While this period of the Universal Century is very vague and enthusiastically explored by fans, it is known for certain now that Amuro piloted a model of the Ζ Gundam during the Gryps and first Neo-Zeon war. This suit however, was the MSZ-006-3, a suit much closer related to the original Ζ than the Ζ Plus line (it was the rumoured 'Zeta Gundam Unit 3', with the only difference is its colour scheme). This suit and Amuro at its controls were featured in the short CGI film Green Divers, which all but confirms that Amuro may never have piloted the A1. However, it is possible that Amuro may have piloted the Z Plus A1 (or at least tested it), but received the MSZ-006-3 Zeta Gundam (which also featured in the recently released CGI film Gundam Evolve 9) shortly after.