Fringe is easily one of the most intriguing sci-fi shows on TV and always seems to keep us on the edge of our seats every week. A new teaser trailer for the season four premiere (which hits Fox on Fri. Sept. 23) focuses on Olivia and Peter. Olivia is talking to an unknown man about how lonely she is. Surely, this season will be filled with mystery as usual, but it already appears to be much more emotional than seasons past. Check out the trailer and tell us — are you excited for season four?