In the concluding half of the season finale, Dr. Connor and Frank are taken prisoner by rebels in a Central American country wracked by a meningitis outbreak and a deadly earthquake -- but the pair convinces the squad's leader (as Baracas, guest star Jesse Borrego) that his missing sons are trapped with Dr. McCabe in a ruined mission. As they work together and hope to arrive in time, Dr. Durant and Dr. Ewing fight a swelling meningitis epidemic that threatens a young mother and baby while much-needed supplies are hijacked. In addition, a sympathetic Eva can't ignore a forlorn boy who lost his parents in the temblor.