Every season of Investigation Alien ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Investigation Alien!

Oregon ranchers report a wave of animal mutilations linked to crop circles. Are UFOs to blame? George and ex-CIA officer Doug delve into the mystery.

Why Are They Here?

George and combat pilot Vee visit a Brazilian island to investigate new sightings and uncover a possible link to a '70s UFO attack that occurred nearby.

The Brazil Connection

Could extraterrestrials be dwelling in our oceans? George and Doug head to Tampico, Mexico, to investigate claims of a magnetic alien base off the coast.

Alien Waters

Determined to dispute a Pentagon report denying the existence of UFOs, George digs into a bombshell claim and sends Doug to a possible crash site in Iowa.

The Counter Report

George and Vee receive new intel on the Phoenix Lights, a mass sighting reportedly witnessed by thousands. Experts test the debris from the Iowa crash.

The Phoenix Lights

In a rush to complete his counter report, George tracks down a witness to a key Big Sur sighting and delves into a theory about time-traveling aliens.

Alien Identity

In this gripping docuseries, legendary reporter George Knapp travels the globe to uncover new evidence about UFOs and investigate their presence on Earth.

The Best Seasons of Investigation Alien

The Best Seasons of Investigation Alien

Season 1