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A Matter Of Time

The Enterprise makes way toward a planet known as Penthara Four, where a massive asteroid has struck an unpopulated continent. Fearing that the resulting dust cloud could lead to a devastating ice age like the one that occurred on Earth in the late 21st Century, the crew hopes to find a way to counteract the cloud's effects. As they travel toward the planet, a bright f lash appears on the Bridge, and a strange man materializes before the crew. The man reveals that he is a Professor Berlingoff Rasmussen, a historian from the late 26th Century Earth, who has traveled from the future to study the Enterprise. Although the crew is suspicious of Rasmussen, his presence arouses their interest in the future, but Picard insists they refrain from questioning their guest so they don't end up changing the future.

The Next Generation, seizoen 5