Nate is one of my favorite NCIS LA characters, played by the terrific Peter Cambor. His appearances on the series are always a big highlight for me. This episode really uses his character well with some interesting moments and it also features a very sinister appearance by the actor who played Jesse Pinkman's group therapy leader on Breaking Bad. His role here is very unnerving indeed and there are links to Callen's past. Over all, Genesis is a compelling episode and well worth watching.