With many prominent politicians and military people expected, there are hectic preparations underway for the celebration at NASA to be coupled with the arrival of Space Shuttle Atlantis from its latest mission. With everything going on, the last thing that base personnel need to contend with is a bomb threat. Bull is drawn into the investigation with only a few hours to find out if there is a bomb, where it could be and to disarm it before Atlantis lands. Also, Jack and Zeke are participating in an experiment testing the design of a newer lighter space suit. Jack, in a careless moment, fails to monitor Zeke in the pressurized tank. When Zeke collapses, Jack rushes, unprotected, into harms way to rescue Zeke - only to collapse himself.