It seems the bank robbers are using a device that creates a sound resonance so severe, it somewhat hypnotizes all who hear it and leaves them in a euphoric state for minutes after.
[4] IGN reviewer Ramsey Isler felt the series needed a solid second episode after the lackluster pilot to keep viewers coming back, but "Resonance" failed to do that, and was worse.
[6] TV Squad reviewer Mike Moody enjoyed the episode's cast and "goofy old school tech" but not its "formulaic" plot, saying "the procedural elements of the story were pretty dull for a sci-fi show.
[7] TV Verdict reviewer Stephen Lackey singled out the old looking gadgets as the episode's best parts and the procedural aspects as its worst.
[8] Lackey enjoyed the various subplots but felt Helfer was underutilized, with her character appearing mostly in the first half, saying, "she's just in the episode to look good and be flirted with by Pete.