Plot summary
Challenger is trying to harness the energy of the wind to generate electric power for the tree house when a storm erupts and a gigantic ball of lightning strikes Challenger's windmill. In the ensuing silence, the sputtering sound of a small engine is heard, and a helicopter appears in the distant sky. It draws nearer and lands in the clearing - all on board, a family of 20th century tourists and their pilot, survive. As Challenger and the others marvel at the new arrivals, Marguerite tries to come up with a way to escape the plateau in the helicopter, at the expense of the others if need be. Meanwhile, a hostile tribe has also seen the smoking helicopter land and want to make it theirs, resorting to a kidnapping as a means of achieving that goal.
Credits
Adapted from Wikipedia contributors, List of The Lost World episodes. HTML formatting and reference markers removed.