Karim.
When B3 notified him of the visitor Sam was expecting another soldier, but to his surprise the one waiting outside turned out to be a kid. Sure he was wearing camouflage, but his height and youthful face told that he was still in his early teens.
"Are you the 'Doctor'?" The boy asked.
Sam looked down at himself. He wasn't wearing his lab coat this time around so there was no hint pointing to his nickname. He guessed that the boy heard it from one of the girls, but if he came here to see their leader it didn't make sense to address him that way.
"Indeed." Sam said, stepping down out of the shit. "Are you one of them, perhaps?"
The boy glanced in the five soldiers' direction. All of them had their arms and legs restrained so they wouldn't hurt themselves in a pointless attempt at escape. His eyes returned to Sam next, and without answering the question he went on to say
"The elder wants to meet you."