Your Handy Guide to the Many Characters of AMC's The Terror

Henry Collins (Mr. Selfridge's Trystan Gravelle) makes a big splash — literally — in the first episode when he volunteers to jump into the ocean and remove a piece of ice lodged in the ship's propeller. He's popped up here and there since then, which is understandable when you see the zombie water ghost of a former colleague floating toward you in the Arctic, you know?