Avengers Assemble #14AU (Age of Ultron)

Avengers Assemble #14AU is where the Black Widow has a very very bad day.  This is also one of the comics that contradict the main storyline where Ultron takes over in the night and everyone just wakes up with Ultron in control.  Anyway lots of people die and Ultron uses way too many different ways to kill people when just sending out bots would have worked.  The comic ends when the Black Widow meats up with Moon Knight at the S.H.I.E.L.D slash Nick Furry bunker.