Season 2, Episode 4:
After a teenager mysteriously disappears, the team investigate, and narrowly save Jenny from death at the jaws of a highly unusual shark lurking in the Thames. Cutter is convinced that the creature's unique morphology is the result of further evolution - that it's a species from the future. They then split up to find the creature's lair but trouble brews when Abby is dragged through an anomaly by another carnivorous species from the future: the Mer.
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