I'm a big Star Trek fan, and of the various series, The Next Generation is my favorite.
One particular episode that I remember well is one in which a God-like being named 'Q' becomes mortal and has no more powers than any other human. Yet, for all his new frailities, Q still has a vast array of knowledge about the nature of the universe.
At one point in the story, the crew of the Enterprise is trying to find a way to save a planet from being struck by its moon, which is in a decaying orbit and soon to come crashing down to the ground.