NCIS: Los Angeles - 'Callen, G' Full Episode — 05/25/10

Callen races against a ruthless adversary to locate a woman who knows the whereabouts of a forgotten fortune earmarked to fund a new war in the Middle East - on the first season finale of NCIS: LOS ANGELES, Tuesday, May 25

Continue for more details and photos from the NCIS: Los Angeles Finale...

While enjoyable on their own merit, most NCIS: Los Angeles episodes lack the character depth and interwoven, ongoing story arcs that make the original NCIS so terrific.

In the spinoff's defense, it's only the first season, and what was unquestionably its defining story arc thus far - "Missing" and "Found" - ended in Agent Dom Vaile's death.

Still, heading into the second season this fall, we need a little more to go on. First and foremost, who is this mysterious Callen and why should we care about his past.

We may find out in Tuesday's season finale, titled simply "Callen, G." In last week's "Burned," Chris O'Donnell's character was blackmailed with information about ... himself.

Who knows where Callen comes from, and why is that a major deal? What exactly was the information trafficker, Kilson, killed last week hiding, and who was he working for? Theories are welcomed.

 Source: TV Fanatic

It will be interesting to see what is revealed about Callen, as well as who is targeting the OSP. Click to enlarge photos from the NCIS: Los Angeles season finale below ...