Defiant, brave and free, the great abolitionists Thomas Garrett, William Still and Harriet Tubman, along with hundreds of lesser known and nameless opponents of slavery, formed a Corridor of Courage stretching from Maryland's eastern shore through the length of Delaware to Philadelphia and beyond -- making the Underground Railroad a real route to freedom for enslaved Americans before the Civil War. Long-format interviews with prominent historians blend with dramatic reenactment to create a powerful story about the fight to end slavery. Actors Edward Asner and Blair Underwood portray the two most prominent abolitionists on the eastern line of the Underground Railroad, Thomas Garrett and William Still. Bearing a remarkable resemblance to Thomas Garrett, Asner reenacts the famous courtroom scene in 1848 in which Garrett foreshadows the Civil War and firmly declares to redouble his efforts in fighting for true freedom in America. In spite of the court's imposition of a crippling financial punishment, Garrett's ideals were not altered; his clandestine activities continued for many years even during the War. Reading documented text in the form of letters exchanged by Thomas Garrett and William Still (a free black abolitionist in Philadelphia), Asner and Underwood bring to life the fascinating working relationship between the two men and those they helped. Underwood, as William Still, meets in secret with the frightened fugitives who pass through his Anti-Slavery Society Offices in Philadelphia on their dangerous journeys to the north.