Phil and Heather head to Norway to find the truth about the mysterious Hessdalen lights on the next episode of “Expedition X.”

“Expedition X,” season 10, episode four airs at 9 p.m. Wednesday, Sept. 10, on the Discovery Channel.

LIVE STREAM: Fans can watch the Discovery Channel without cable on Philo, which offers a seven-day free trial; DirecTV, which has a five-day free trial; and SlingTV , which has new flexible one-day, week and weekend passes.

The episode is called “Arctic UFOs.”

The synopsis is “Norway’s ice-cold Hessdalen Valley is one of the hottest spots for UFO activity in the world. Phil and Heather scour the skies and dive the valley’s depths using cutting-edge tech in search of the truth behind the mysterious Hessdalen Lights.”

The cast of “Expedition X” is Josh Ga

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