Warning: The following contains SPOILERS for Young Justice season 4.
The Justice League of Young Justice apparently recruited a new Green Lantern off-camera, bringing the total number of interstellar peace-keepers on the team to four. However, there is no hint as to who this mysterious fourth Lantern might be. There are a sizeable number of candidates to be considered, given how many Earthlings have been found worthy to wield the power ring of the Green Lanterns in the comics and how many of them have yet to be introduced into the reality of Earth-16.
The opening story arc of the second half of Young Justice season 4 found the peace of Atlantis threatened by a battle for the crown of the High King. The matter was resolved with Orin, the first Aquaman, stepping down to allow Mera to take the crown. When he announced his intention to return to the Justice League now that he was no longer High King, Kaldur'ahm, the current Aquaman, said he would gladly step aside. Orin dismissed the idea, however, saying "If the League can include four Green Lanterns and two Flashes, I believe it can embrace two Aquamen."
Related: Young Justice Highlights A Time Travel Error DC Tends To Ignore
So who is this fourth Green Lantern hinted at in Young Justice? The most obvious candidate is Kyle Rayner, a young artist who was the next Green Lantern of Earth in the comics chronologically. Another possibility for the fourth Green Lantern alluded to in Young Justice season 4, part 2 is Simon Baz, a Lebanese American mechanic and devout Muslim, who was introduced into the comics in 2012. Finally, there is survivalist Jessica Cruz, the most recent of the modern Green Lanterns of Earth, who was chosen as a worthy recruit after overcoming her fears and
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