Booth and Brennan Question a Lead in "The Source and the Sludge."

Booth listens to what Agent Beck has to say on "The Source in the Sludge."

Agent Danny Beck questions a lead on "The Source in the Sludge."

It looks like Booth might have found his man, flanked by Agent Beck and Brennan on "The Source in the Sludge."

Booth and Brennan encounter insurance issues about the two of them working in the field on "The Source in the Sludge."

Freddie Prinze, Jr. returns to Bones as CIA Agent Danny Beck in "The Source in the Sludge."