Ed Quinn and Pascale Hutton star in this sci-fi action drama directed by W.D. Hogan. In the small town of Ascension, construction worker Thomas Walsh (Quinn) is based at the foot of Mount Lincoln. When tremors start to shake the earth around them Walsh decides to investigate the history of the mountain to see if anything similar has been recorded there before. As he crosses paths with geologist Emily Allington (Hutton) who is also researching the mountain, they discover that it is not the mountain that is causing the tremors, but what lives inside it.

All 18 episodes from the fourth season of the Canadian drama set on Heartland, a family-run ranch in the Rocky Mountains dedicated to the rescue and rehabilitation of ailing horses. In this series, the relationship between Ty (Graham Wardle) and Amy (Amber Marshall) faces its first real challenge, while Tim (Chris Potter) is lucky in both love and finance. The episodes are: 'Homecoming', 'What Dreams May Become', 'Road Curves', 'Graduation', 'Where the Truth Lies', 'Win, Place Or Show', 'Jackpot!', 'One Day', 'Local Hero', 'Mood Swings', 'Family Business', 'Lost Song', 'The Road Home', 'Leap of Faith', 'The River', 'Never Surrender', 'Burning Down the House' and 'Passages'.