Scar Charlie makes the most sense.Maybe a spoiler about...
In a TV Guide interview with a couple producers of Fringe, one of them mentioned he had just left a set where Kirk Acevedo was filming, and TV Guide pointed out that the show was working on episodes 8 and 9 at the time. Could be a flashback or something going on inside Olivia's head, but it could also be Scar Charlie.



Geez, does every company shown on TV need to exist in reality? Talk about lawsuit potential.