Watch FBI Online: Season 4 Episode 18Paul Dailly at .
Did OA and the team survive the most harrowing case yet?
On FBI Season 4 Episode 18, things took a dangerous turn when it emerged that deadly sarin gas could have been sold to terrorists.
As OA and Maggie tried to save everyone, one of them was caught up in the gas, leading to one of the most shocking scenes yet.
Elsewhere, Isobel pressed on with a new mission that could secure the future of the team.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.