X-23. Ah, now this was good stuff. Where House of M was certainly epic in scope and had a definite 'wow!' attached to it, this managed to get a similar 'wow!' while being much smaller in its focus - namely, the origin of X-23 before her introduction in the interesting NYX, the more famous character Wolverine's..uh...sister? Clone? Daughter? In any case, while it's a bit gory at times for the average Marvel fare (ie, don't be surprised), it's interesting how much emotional weight can be drawn into this medium (no pun intended).