You may enjoy below the trailer of “The Bullet That Saved The World”, the next episode of Fringe Season 5:

Fringe 5.4 – The Bullet That Saved The World
Fringe S05x05 The Bullet That Saved The World
Episode summary:
“When the Fringe team tracks a lead into a hostile and heavily guarded location, Phillip Broyles resurfaces…but can he be trusted?”

Hell yes, Olivia got an idea! The Observers will pay back for their invasion!
:)