Synthoids were also seen in "Batman Beyond", being artificial lifeforms featuring technical specifications very similar to those of the G.I. Joe counterparts. The most prominent synthoid of the show was Zeta (who also received his own spin-off show), an infiltration unit designed to seek and destroy specific people, and had the ability to holographically disguise himself as any individual he had seen, as well as create custom appearances through mixing physical traits of those individuals. In the show, the term "synthoid" was sometimes used interchangeably with "robot". Whether this usage is colloquial (and thus technologically erroneous) was not revealed.