User blog comment:The Dark Lord of the Sith/Reviving "The Clone Wars" - Episode 1, "The Bad Batch"/@comment-3298705-20141204032100

I'm thinking this episode arc will have something to do with the Expanded Universe (Star Wars Legacy, now....) story of the disappearance and subsequent hunt for Ko Sai. It is revealed that Ko Sai is the one who found and rebuilt Echo after she left Kamino to hide from those who sought her research; the hunt would take Rex and the other clones to Anaxes, and then Skako Minor.

I like the names for the members of the Bad Batch that Gavin of Univerism came up with below, as well as their functions. The reason why the Bad Batch is so "unorthodox" is they were the first clones to ever be created by Ko Sai. She deemed these stubborn, uncontrollable troopers a failure and scheduled them to be terminated but never got around to it. The clones, who are different from Rex because they do not have inhibitor chips in their brains, are a "bad batch," and they were referred to as such so many times on Kamino that they decided to use these words as their squad name.

This episode arc will allow us to see the terrible experiments that were performed to create the clones, as well as the experiments that were done on the clones once they were brought into existence. I'm picturing a scene in which Rex, the Batch, and Echo enter an abandoned laboratory that once belonged to Ko Sai. It is filled with tanks containing malformed clones, similar to ALIEN: Resurrection.

Eventually Ko Sai is found dead and Echo also dies somehow, as well. In the end, the horrors of this arc are too much for Rex to live with and he somehow decides it's time to request that Anakin discharge him from the clone army. Rex is then replaced by Appo as leader of the 501st.