The series only has one parallel universe, but, what if there was a third one, that was looking in a specific building for an item of high value and importance. I would be part of the security detail for a team that was looking for such an item, hidden in a spot somewhere perhaps in an observatory, or Opera house, as in the Fringe season one.
I could be left behind and have to survive in a strange parallel Earth, or I could be captured. Tell me your thoughts and what could work. After watching some season three episodes, I'm in the mood for one like this, and if it appeals to anyone, let me know.
Another possible one is where Im a Marine corps pilot, piloting a V22 osprey warbird with ten seals or delta force spec ops in the back. Flying over New Yorks east river with two others on a training exercise, I fly through a soft spot in the air,and appear in the parallel universe in the same spot. The v22 could be damaged and land in the water, or land safely.