User blog comment:JediSpectre117/Citadel DLC, conspiracy, Thoughts?/@comment-24174486-20130301034311

I know who the mastermind is going to turn out to be.

KEI-9.

KEI-9 will turn out to have been behind everything in the DLCs. It controls the Leviathans. It preserved Javik. It (bleep)ed with Aria. And in the ending, it will appear to chomp on the Catalyst's butt, causing the Catalyst to run around screaming its "head" off.

At which point Shepard will wake up from indoctrination...having been knocked out due to being hit with several biotic Shepard-falls-downs and striking their head against a malfunctioning object during a mission back in ME1.