Tall people came from our alien ancestors

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I rememebered watching a documentary about UFOs in the Discovery Channel. Its about an alien race that once lived here in our planet. It says that the Summerian wall carvings that show their kings and leaders as taller than their subjects were not carved in a perspective view, but in their real sense. There was also a book in the bible that tells of the extinction of giants through the great flood (with population figures). It also showed and interviewed people (from Russia) who actually saw giants landed here on earth from a UFO in the 1970's, they were younger then, but they were pass their 30's when interviewed. The documentary also reported that these giants came from a member planet of our solar system but has a very ellipse orbit around the sun, such that they were able to come to earth only when they are nearest to the sun. It also commented that these giants might have intermarriage with our ancestors. This might be the reason why mankind seems to be growing taller. There are lots of 7-footers now in NBA compared to 10-20 years ago. Agree or Disagree?