User blog comment:MeDeoPal/On the Origin of Titans and Shifters/@comment-108.75.190.168-20130819062309

My personal guess is that the serum that Eren's father injected him with made him a titan shifter. That his father was apart of the wall cult to infultrat it and find out the secret to making titans. The government was probably making kids into titans (for reasons I can't think of) and he was a double agent of some kind. The ape titan may be a seperate orginization that is trying to release the titans inside the walls to wipe humans off the planet, and start a new better breed. (saying that humans are obsolete). He probably convinced the current titan shifters (excluding eren) to do this. Maybe his father even knew about this and was planning a coup' de ta against him, and all of his plans/ information is in the basement. Maybe for making more titans as well. Maybe the Ape titan was the Original titan who was experimented on or something. I dunno, just a theory :P.