HBO's Lanterns has pushed one of Green Lantern lore's messiest ideas into the open. In episode 2, Trust Fall, John Stewart is kidnapped by Antaan's group, and the search for a Manhunter takes a turn that has nothing to do with Martian Manhunter.
That matters now because Stewart is not walking into this as a rookie. By the time the first episode begins, he is already several weeks into training under Hal Jordan, which means the threat that hits him in Trust Fall lands on someone who is already learning how this world works. Antaan's men look human, but they are described as survivors of a distant planet, and their presence in Rushville, Nebraska pulls Jordan and Stewart back to the rural town even as a local militia led by Will Macon closes in.
The episode gives the mystery its weight by tying it to a threat that is bigger than one missing man. Antaan tells John and Hal that he will destroy the entire town unless they give up the identity of their quarry. John and Hal call that quarry a Manhunter, and the show frames the term as part of Green Lantern history, not a shorthand for the better-known Martian Manhunter. The difference matters because the Manhunter being hunted is an old machine-made menace, not J'onn J'onzz.
In Green Lantern lore, Manhunters are brutal androids powered by the same emerald energy that lets Jordan and Stewart power their rings. Their warning is as cold as their purpose: No man escapes the Manhunters. The Guardians of the Universe created them long before the Green Lantern Corps as an early peacekeeping force, then abandoned them after they proved too uncaring and wiped out an entire space sector. Instead of destroying them, the Guardians left them in exile.
That exile is where the story turns stranger. The Manhunters spread to other planets, took on the features of the people living there, and tried to blend in. On Earth, that history is tied to the founding of the Manhunter Cult, which is why Antaan's group can look ordinary while carrying a much older grudge. The show is not using the name as a nod to Martian Manhunter. It is reaching deeper into DC continuity and letting the audience catch up the hard way.
The unanswered piece is the one that keeps the episode moving. Antaan's quarry is named only as a Manhunter, not identified more precisely, and the threat to erase an entire town raises the stakes without solving the mystery. For now, the series has made the term larger, colder, and more dangerous than a casual fan might expect, and it has done it by putting John Stewart in the middle of it.

