Jack Donnelly, Mark Addy, Robert Emms Jack Donnelly, Mark Addy, Robert Emms

In the lost city of Atlantis, almost anything is possible ... such as a random pride of hunting lions.

On the premiere of BBC America's new adventure series Atlantis (Saturday, 9/8c), young Jason (Jack Donnelly) happens upon the mystical city while searching for his father. During his quest, he befriends the schlubby blowhard Hercules (Mark Addy) and the sharp-witted Pythagoras (Richard Emms).

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The trio almost immediately find themselves caught in adventures, which includes this run-in with someone's furry, oversized security system. Check out the exclusive sneak peek to see how they fare:

Atlantis joins BBC America's Supernatural Saturday lineup this Saturday at 9/8c.