Star Trek Discovery 4x05 Clip - The Dangerous DMA Experiment - Promo Trailer HD - Under risky conditions, Lt. Commander Stamets (Anthony Rapp) collaborates with willful scientist Ruon Tarka (Shawn Doyle) to run an experiment that will help them understand the DMA. Stream all-new episodes of Star Trek: Discovery on Thursdays, exclusively in the U.S. on Paramount+.