I purchased this set and then discovered that several sections would not play, either in my Mac or my Toshiba dvd player. The defective dvd's cause my Mac and dvd player to completely freeze up, and the only option to correct the problem is to unplug the power cord. When I contacted Spacecraft Films, they refused to believe me, and refused to replace the faulty dvd's. My recommendation to you is, DO NOT purchase from this company!