Dr. Catherine Halsey is one of the most enigmatic characters in the Halo series.

Could she be the villain of Halo 5?

This article doesNOTcontain spoilers forHalo 5: Guardians.

Shes the woman who ordered them kidnapped as children for put them through terrible experiments.

Its peculiar then that she remains a sympathetic character to the Spartans, particularly John-117.

Halsey is one of the most complex characters in theHalofranchise.

However, most of her development goes on in the periphery of the games.

Could Halsey become a target for Agent Locke inHalo 5?

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She had lost an arm to Spartan Sarah Palmers bullet and was in the business of revenge.

In the on-goingHalo: Escalationcomics, Halsey continues to side with Jul Mdama.

Halsey notes that my compatriots were a hit squad, not a rescue team.

Shes desperate and hardened by Sarah Palmers attack.

The UNSC just tried to execute me.

So youll need to offer something other than idle threats if you want me to help you.

This could set her in opposition to the UNSC as a whole.

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In the current run ofEscalation, Halsey is still critical of the UNSCs actions.

Her enmity would force John to fight a mental battle with the person who knows the most about him.

The invisible story ofHalois the story of Halseys success.

Master Chief saved the galaxy because Halsey had augmented him.

John has been given easier struggles compared to ONIs secrecy in theHalonovels and Halseys tentative alliance with Mdama.

If John finds her to be working with the Covenant, he could feel betrayed and conflicted.

Halsey is both Cortanas template and the destroyer of many AI, including Cortanas sister unit Kalmiya.

A good portion ofHalo 4s plot involved John trying to get Cortana back to Halsey.

Chief could seek Halsey out inHalo 5to restore Cortana, but would the doctor even care?

This could be one of the few things that would turn the Master Chief against his creator.

Osman hates Halsey and ordered the attack on her, and Halsey knows it.

Halsey could continue to oppose ONI on her own, behind the scenes, without even Jul Mdamas knowledge.

It seems unlikely that she would die, even if she becomes an antagonist.

Halsey survives until the year 2589, her voiceover inHalo: Reachindicates.

Instead, it would continue to deepen the character of one of theHaloseries richest creations.

Halsey can never quite be a hero, and she can never quite be a villain.

The fate of the planet may rest in her hands.

Megan Crouse is a staff writer.