Synopsis by Hans J. Wollstein
Although he appeared to have perished on board the escaping launch, chapter three of S.O.S. Coast Guard reveals that Terry (Ralph Byrd) managed to escape just before the explosion. Boroff (Bela Lugosi), meanwhile, demonstrates his cunning by having the coast guard deliver Krohn (Henry Hale), a foreign scientist necessary for the further development of the fiendish disintegration gas. Pretending to be the victim of severe burns, Krohn is "saved" by the coast guard and brought to a waiting ambulance secretly in the employ of Boroff. Snapper (Lee Ford) is invited along for the ride but his elation turns to horror when Boroff decides to test the disintegration gas on him. Terry, however, interrupts this chilling turn of events and a scuffle ensues. The fight ends abruptly when Boroff cracks a vial with the deadly gas.