Rachel and Chandler ask for six volunteers to participate in human trials of her vaccine, but the tests could be a living hell as the virus and the vaccine do…

Chandler and his crew finally returns home, where a former D.C. power player is fending off a dangerous warlord who threatens her hopes of restoring law and order in society….

Chandler’s leadership is put to the test when the ship’s propulsion system is in danger of breaking down, the crew becomes overworked and exhausted, and Dr. Scott could potentially lose…