Which DC series is Lanterns described as the third television series in?

Lanterns is described as the third television series in the DC Universe.

The DC Universe, or DCU, is the shared franchise created under DC Studios’ new leadership. Lanterns is part of the first chapter of that setting, Chapter One: Gods and Monsters. It follows Hal Jordan and John Stewart and serves as the DCU’s main Green Lantern project.

The series is not identified as part of the older DC Extended Universe, commonly abbreviated DCEU. It is also separate from the Arrowverse, the earlier collection of interconnected DC television programs associated with The CW. These franchise labels are easy to mix up because many DC characters and concepts have appeared in multiple continuities.

Lanterns was designed to stand alone as a complete mystery while still helping establish the wider DCU. The story begins with a murder investigation in Nebraska and uses Green Lantern mythology to connect that local case to larger threats and institutions.