eh... I never got into Mortal Kombat (The fact that couldn't spell Combat correctly was a bit of a turn off). She doesn't get the Zombie army as a "prize" or reward. Okay, explanation time.
The Zenderon is the last of his race, the Zenderon. His race at first glance appeared telepathic. This was an illusion. Their psionic abilites were artificial, granted to them by what they called "The United Virus". It connected them all to a deep well of psionic energy. Basic Zenderon psychology was broken down into the non-mind, the basic desire and needs, the under-mind, the individual self that has flaws such as jealousy, prejudice and fear, and the Over-Mind, a unified intelligence that they could enter and depart from at will. There was no need for school, no need for communications equipment, there was always the Over-Mind. And using the psionic powers of the Over-Mind, they could accelerate healing, move heavy objects, using the Psionic Well the Unity Virus gave them access too.
When Kroeng shows up, he takes 15 Zenderon to his ship. Sadly, this was not enough to give them adequate access to the psionic Well (each Zenderon could only access so much of it). the Zenderon lost. They tried fleeing their world, but Kroeng began to hunt them down. as fewer and fewer Zenderon survived, they became more and more powerful. It was shortly before the being we know as "The Zenderon" became the last that he created the Strangers, as he could use his connection to the psionic well foresee that Earth was next. One of the Strangers, he left as a baseline, but infected with the Unity Virus. This was a mistake.
The between the anatomical and physiological differences between Zenderon and Human, and the mutation the Unity Virus had undergone at "The Zenderon"s tinkering, it came out wrong. It did indeed connect the hosts, and it did grant them use of the Psionic Well, but it wiped out what the Zenderon would call our "Under-Mind" our intelligence and individulaity, leaving only our Non-Mind. Primal instinct and base driving urges, primarily: Hunger. the Psionic Well was accessed on only the most basic levels. It kept the human hosts alive, and pain free. other than that... nothing.
"The Zenderon" has perfected a human version of the Unity Virus and, after explaining his mistake and the Unity Virus to Keisha Washington, offers to make her the Overmind for the Zombies.