Enterprise - Season 2 Episode 8

Upon returning from covertly observing a pre-warp culture, Lieutenant Reed realizes he lost his communicator somewhere on the planet. Archer and Reed return to recover the lost technology, only to find the natives found it first. Captured and interrogated, the crewmen find themselves doing even more damage to the culture, who have scanned the prisoners and know them to be of another race. Meanwhile, Tucker and Mayweather try to figure out how to activate the cloak on the Suliban cell ship so they can mount a discreet rescue.