The remnants of 2nd Mass have set up a temporary base at an abandoned airfield; Anne is overwhelmed with patients who have the flu while Ben and Jimmy are out on patrol duty and kill a group of Skitters.
They kill two of them but the third one exerts some influence over Ben and paralyzes him, causing his spikes to glow blue.
Weaver and Tom find out that Ben was deliberately seeking out aliens to kill as revenge for kidnapping him.
Pope, Tom and the Berserkers head out to the spot where Jimmy was hurt and find his compass and encounter a group of aliens collecting the bodies of their dead.
Tom demands he return it, and Pope refuses and calls Jimmy's funeral "an empty gesture".
In its original American broadcast, "Compass" was seen by an estimated 3.81 million household viewers, according to Nielsen Media Research.