The film opens with Cross in the middle of the Alaskan wilderness, having to fend off a wolf attack and survive a hostile environment until he meets up with another agent (Oscar Isaac). Cross learns that he's not the only product of Outcome and is forced to make his way back to civilization after a drone attacks their isolated cabin.
The biggest problem with The Bourne Legacy is that it only sporadically makes sense, even as it has a similar frenetic energy and impressive action scenes. Without spoiling it, I can't detail exactly what's broken, but how does Cross know what he knows? How does he get from one place to another so quickly?
Worse, the base story revolves around the government creating super addicts through genetic-altering mental and physical drugs: much of the film is Cross running, as any addict would, to find his next fix. That Dr. Shearing so quickly decides to help him is hard to accept for just this reason. A bit disappointing as a primary motivator, rather than honor or even revenge.