Friction between the lower deckers and senior officers grows when the former are accidentally left behind in space following a spacewalk repair mission. Shari yn Yem, a Starfleet drill instructor, oversees a series of holodeck drills to build better understanding between the crew. They all fail their assigned drills, with the exception of Boimler who achieves high marks but obsessively reruns the drill in an attempt to achieve a perfect score. Mariner and Freeman's disagreements cause the team to fail a simple docking drill in record time, and they come to better appreciate one another. They suspect that the drills were rigged for failure to bring them all together, but Shari reveals that this was actually a bid to ensure her continued employment...