Mission: Impossible Season 3 Episode 9

This episode has no dossier scene.

Earlier it was established that someone in the sound-suppression system wouldn't hear anything but the sounds beamed at them. But in the theater, Vados calls out "Stop!" and Kuro hears him before Barney turns off the suppression system.

Trivia: The briefing tape doesn't self-destruct - Jim tosses it down a heating vent.

The sound envelope is referred to as a "radar" device. Radar has to deal with the transmission and blocking of radio waves. Correctly the term used should have been "sonar", which refers to sound.