While trying to understanding what went wrong with the attempt to dial Earth from inside the star, Homeworld Command sends two officials, Senator Michaels and Dr. Andrew Covel, a scientist who has worked with Rush, to Destiny via Camille and Greer's bodies. The Senator grills everyone onboard about the veracity of Rush's timeline story and shows her strong disdain for the incompetence of the entire crew. Chloe, whom the Senator has known since she was a baby, attempts to change Michaels's mind, but her opinions are firm.
Greer and Camille, meanwhile, have a rough introduction to Earth due to a heightened terrorist threat from the Lucian Alliance - a massive attack is imminent and they must head for safety immediately. Greer fumes at Camille for forcing him to leave Destiny, but before Camille has a chance to tell him it was for his own mental health, an alarm sounds - Camille runs for the exit, but Greer recognizes that they don't have time and forces them both under cover.
When the two eventually crawl out of the rubble, they come across an airman, miraculously alive, and a radio with which to contact Telford. He informs them that a cloaked Lucian ship crashed into Homeworld Command, and all their intelligence suggests that another hit, probably in the form of a radioactive bomb, is believed to be in the building. Camille insists that, since no one can get in to rescue them and they can't get out, she, Greer and the airman must attempt to defuse the bomb that was onboard the cloaked ship. Telford protests, but there is no other option available.
Destiny, meanwhile, drops out of FTL and the communication stone connection is severed. Michaels and Covel see the wreckage at Homeworld Command and understand that the levels of radiation to which they've already been exposed are lethal. Onboard, Camille has just enough time to spit out the information to Young that she and Greer are attempting to defuse a Lucian bomb.
Varro, one of the Lucian soldiers onboard, offers his expertise on how to defuse the bomb, and though Young is skeptical both because of the man's origin as well as his budding relationship with TJ, he accepts the help. Michaels and Covel prepare to take this information back to their own bodies to defuse the bomb - but the connection cannot be severed. Rush soon discovers that Covel has disrupted the logarithm that controls the connection so that he wouldn't have to return to a condemned body. The realization that corruption is stronger in her team than aboard Destiny changes Michaels's opinion of the viability of the mission. She orders Rush to amend the logarithm, and Covel to submit to having his connection severed. They return to their bodies and save hundreds of thousands of lives by neutralizing the alien bomb.
Greer and Camille, recovering from their near-death experience, have a newfound respect for, and understanding of, each other. They offer comfort to one another as their lonely but desperately important mission continues.