Leonard Nimoy's Primortals

Sixty-five million years ago, aliens rescued a handful of promising species from doomed Jurassic Earth. They let them survive on new worlds and evolve into beings and civilizations far older, far wiser - and sometimes far deadlier - than anything we can imagine. Today, one of Earth's lost descendants is coming home...
Grad student Stewart Davies, working at a minor SETI listening post on Long Island, is the first to intercept the signal. It is not a hoax or an accidental burst of radiation. It reads: "I am Zeerus of Achernar Three....We have much to discuss." Those words will transform the lives of Stewart Davies and his girlfriend, Jess Rossini; of Joint Chiefs Chairman Gen. Larry Hightower and White House Chief of Staff Laurie Sherman; of NSA specialist Maj. Steve Hayes; and of Jake Holcroft, an eleven-year-old genius on the run from his fanatic father's underground militia.
For the signal hasn't come across billions of light years. A starship, carrying one alien, has entered the solar system, approaching Earth. And every old movie and TV show has suddenly become terribly real.