the idw comics series, which began in 2011, presents a new origin for both splinter and the turtles. all five were originally test subjects at baxter stockman's bioengineering firm, stockgen corporation. when agents of the foot clan break into stockgen and attempt to steal an alien mutagen, splinter and the turtles escape but are exposed to the mutagen in the process. while the element of splinter being hamato yoshi is still present, oroku saki is now the foot clan's medieval leader, with splinter and the turtles being the reincarnations of yoshi and his sons.