Mal'K'Rettt

With all those apostrophes in his name, you can bet that Mal'K'Rettt is either from a fantasy novel, or an alien.

Yep, he's an alien.

Mal'K'Rett is a Behemoth who suffered some kind of head injury that shorted out a neural override implant. This implant going on the fritz caused some damage to the alien's neural pathways, and essentially freed him of the long-term psionic conditioning that had enslaved him to the will of the Collective. On the downside, it also fried much of his long-term memory, leaving him as an amnesiac who doesn't remember much of his life as a soldier in the army of the Collective.

He was awoken by a mutated dog that he has affectionately named "Dog." He was discovered by members of the Elma Resistance during a conflict near the medical clinic on main street, where the Resistance members were gathering to deal with Chryssalid-infected Pershings. This turned out to be a trap, and Mal'K'Rettt (who was given the nickname "Frank" by the humans), helped them fight off the attackers, which earned him some "benefit of the doubt" in their eyes.