The are a fictional militaristic extraterrestrial race of giants and often the main antagonist in The Super Dimension Fortress Macross anime series and its Robotech adaptation.
It is transliterated as Zentradi, Zjentohlauedy, Zentrady and Zentraedi for the Japanese Macross series, with the Zentraedi spelling being the one most used commonly in the Robotech adaptation. The Robotech novels and comics would add the occasional spelling T'sentrati. In both the Macross and Robotech universes, humans and Zentradi are capable of interbreeding due to being genetically equivalent. Physically, most of them also resemble humans, though some have unique skin and hair colors. Prior to their first encounter with the human race, all members of the Zentradi race were artificially created through cloning.
In the original Macross Japanese anime series (Big West/Studio Nue, 1982) the Zentradi were created as a spacefaring race of giant humanoid proxy war by the first civilization in the galaxy, the Protoculture, 497,500 years ago. They contributed greatly to the expansion of the Protoculture Civilization's sphere of influence and the creation of a Protoculture Stellar Republic that controlled most of our galaxy.
As war broke out with The Supervision Army centuries later, the Zentradi entered into combat with their fearsomely powerful force of millions of space warships and mecha produced in thousands of huge automated factories scattered across the galaxy and legions of expendable giant clone troops. After the end of the war with the Supervision Army, the Zentradi fleets travelled the galaxy in search of Supervision Army survivors until they encountered the human race, an event that caused Space War I (2009–2010).
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Official Site: Robotech.com
Links: Wiki: Zentraedi Zentraedi Military Forces. Robotech RPG