The opening clip usually led to Doc introducing the events of the episode, while the closing clip offered some kind of conclusion and featured a video encyclopedia in which Doc's lab assistant (Bill Nye) would perform a science experiment that the viewers could try for themselves at home.
Doc introduces himself and his inventions, especially the flux capacitor, which "allows me to travel through time the way most people drive across town!" The broadcast is then interrupted by Verne, but is soon restarted. Doc introduces his electromagnetic experiment that he has assembled with Jules's help. He reveals that this is not the first occasion they have constructed such a device. The year was 1864...
Doc tells us that Marty failed his test because he revised the American civil war instead of the Spanish civil war. Doc's lab assistant then gives a demonstration that teaches us how to make a homemade electromagnet. When the camera returns to Doc, he has built his own 'Super-electromagnet' powered by the DeLorean's Mr. Fusion home energy reactor. The magnet begins to attract objects from all over the room, including the camera, which crashes forwards.