Fringe, "Momentum Deferred": 8 heads in a plastic bag

Spoilers for tonight's "Fringe" coming up just as soon as I drop the needle on some Anderson Bruford Wakeman Howe...

"Why are shape shifting soldiers from another universe stealing frozen heads?" -Broyles

Once again, the writers' willingness to have the characters accept and even embrace the weirdness serves "Fringe" well, with "Momentum Deferred" arguably the strongest episode so far of season two.

There were some plot holes (notably, how does it not occur to anyone that Charlie might be a fake as soon as they realize the nurse's corpse wasn't the shape-shifter?), but "Momentum Deferred" was awash in memorably creepy visuals, whether the severed heads being casually tossed down the hill or the creepy final shot of the head attaching itself to a body, or the beautifully edited sequence of Olivia being pulled out of Earth-WTC, smashing through the car windshield and then waking up in Walter's lab.

And I'm glad they brought Leonard Nimoy back relatively quickly as William Bell, and let him explain at least some of the larger plot to Olivia (and us). I still have little faith that the larger story arc will make sense in the end (this is both an "X-Files" pastiche and a J.J. Abrams show, after all), but relatively transparent episodes like this don't make me feel completely cynical about it.

Some other lovely touches: during Peter's talk about his childhood fear of being replaced (which, technically, he did to this Earth's Peter), he and Olivia talk about the 1978 "Invasion of the Body Snatchers," which of course co-starred Nimoy; Theresa Russell's performance as the grown-up but still wide-eyed version of the woman from Walter's old LSD experiment; and the editing of the entire Bell flashback/vision to suggest the strange headspace you'd be in if you jumped to a parallel world.

What did everybody else think?