Noisy Edge is the twelfth episode of the first season. It was released on April 29, 2005.
A UFO is briefly seen flying through Los Angeles airspace with no clear indication of what it is, but Agent Eppes discovers it was heading for the Staples Center and starts an investigation into the possibility of mass terrorism.
"Noisy edge" is a term in mathematics, seemingly referring to the degree of disruption or distortion suffered by a wave in its extremist form. Here the sense is of disentangling one unclear sonic signature from the urban hubbub and extracting the truth from the rumor.