Fairly standard episode with very few twists until the end of the episode was typical a OMFG!! J.J. Abrams twist that make the viewer go crazy. There's an exploding man who was part of a secret military project which leads Peter and Olivia back to Iraq to meet an informant. They come back just in time to save a whole bunch of people. Yay?
More compelling was Olivia still struggling through her problems. After getting pissed at the the bowling alley guru, she pulls her gun and him and lo and behold, she doesn't need her cane!
The big part of the episode was the very end. The apprehended colonel who was behind the exploding bodies starts rambling on about non-humans who are here to wage war. Cut to a diner, and someone's eating a sandwich with lots of pepper. Where have we seen that before? The Observer!! Oh noes!!! What does the Observer need with Walter's pictures?
Fringe has great visual effects and directing which automatically bolsters its score every week, but the story was very lacking and comparison to many of the cooler ones we've seen. No Charlie this week, so he'll probably have a larger role in a future episode which most likely will be his departure.