Board Thread:Questions and Answers/@comment-29752445-20170928174955/@comment-29752445-20170929190541

TheresaMariePascual wrote: Perhaps Zeke managed to develop a method how to do it. The manga said that those who are injected with the serum containing Zeke's spinal fluid can be transformed and controlled by the Beast Titan. Though I'm not completely how he did it with the village. I should read the manga from the start again.

That's how he did it to the village, I mean it was never shown but once we learn he can control them with his spianl fluid then it's obvious.

but the thing is I'm pretty sure marley don't know zeke is royal blood, because I remember someone asking zeke how can he control the titans and what is his secret, and he said something "you'll know when you become the beast titan" (since memories are shared)