Milius and his Animal Squad storm the train. Melanie realizes something is wrong and shuts the vault doors to the engine. But when Ben's life is threatened, Melanie surrenders the engine.

More from Season 4

All episodes

E1 · Snakes in the Garden6.7

E3 · Life Source6.0

E4 · North Star6.5

E5 · The Engineer6.5

E6 · Bell the Cat6.5

E7 · A Moth to a Flame6.7

E8 · By Weeping Cross6.5

E9 · Dominant Traits6.2

E10 · Last Stop6.5

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