The Judge is a transcended being. A long time ago, the Judge was born to an ancient alien race, who created the Stones, before their transcendence. Since the dawn of time, when a species reaches a point where they are able to activate the final code on the Anomaly Stone, the Judge is sent to administer a test to determine if that particular species is worthy of transcendence. Should a species fail the test, as many have, the Transcendents would send Gem9 to wipe them out. The Judge met with Becca Franko when she discovered the code through the Flame, but Becca refused to take the test and returned to Earth, frightened by what she had seen and feeling that humanity wasn't ready.

When greeting their test subjects, the Judge often takes on the personality of the form that they assume for a brief period of time, acting as that person in essence before getting down to the test.

The Judge is shown to have a stern and unforgiving personality to those who they feel is unworthy of transcendence, remorselessly wiping out other species for failing. While the Judge presses a test subject with their questions, the Judge is not cruel with their treatment of them, even when deciding that the species should be exterminated. On a few occasions, the Judge has been shown to apologize for their decisions.

Bill Cadogan stands on a Pierre. Waves rolling. Glowing light appears behind him, and the Judge in Callie’s form appears

The Judge speaks What took you so long?

Bill admires the moment replies Heh. Our Pier. I took you fishing here once.

The Judge replies Why only once?

Bill explains You jumped in. Oh, I told you not to, but you didn't listen. Heh heh heh. You never listened.

The Judge said She took after her Mother.

Bill looked at what he thought was his daughter in confusion You're not Callie.

The Judge elaborated No. This is who you chose. We most often take the form of the subject's greatest teacher or the source of their greatest failure. In the rare emotion-driven species such as your own, it can be their greatest love. Seems you're faced with all of the above.

Bill asks Are you God?

The Judge laughs before saying For our purposes, you may consider me your Judge.

Bill responds My judge? So they were right. This is a trial, a test, not a war.

The Judge says incorporating the essence of Callie into its words Correct. The last of your kind to stand before us - Becca - refused the test. Tell me...Dad, is the human race now ready to join us?

Bill nods answering Yes...we are ready.

The Judge then explains the test Excellent. Here's how it works. We talk, I ask questions, you answer truthfully. If you do not, I will know it. If your answers are satisfactory, your consciousness and that of your entire species will become one with ours. You will transcend your human form and become infinite. If you fail to earn this evolutionary leap, you will be eliminated, turned to crystal the way the Bardoans and countless other civilizations before them were. Sound good? The first question is about love. So few species are given this gift, yet you have attempted to erase it in pursuit of this moment. Why?

A gunshot rings out as Clarke Griffin fired a bullet into Bill’s head, Bill falls, Clarke stands behind him with her gun raised, Clarke shoots Bill repeatedly in the back until she is out of bullets

Clarke killed Bill because he had given Madi severe brain damage that left her unable to perform verbal responses or voluntary motor functions despite being aware of everything around her, this led Clarke to believe Madi was essentially killed as Clarke would have to mercy kill Madi her adopted daughter all because Bill damaged her brain to reach the Judge.

With Bill dead the Judge’s firm was determined by Clarke’s unconscious mind causing the Judge to take the form of Lexa kom Trikru as well as her stoic personality and mannerisms.

Clarke speaks brokenly as Lexa, her greatest love, has been dead for 6 years Lexa?

Clarke runs over and tightly hugs the Judge who’s in Lexa’s form.