Well, I can help with sequence of events quickly. They need to find a missing person who went to a lunar quarantine zone. Finding his notes from him leads the team to his home in earth orbit, a old habitat that he lived in. The information they find is disturbing, his now an exsurgent infected member of the Lost how decided recently to head to his point of origin, an old forgotten lost station Heading to a derelict Lost station, they find databases of information that lead to believe this wasn't a standard watts-mcleod strain, but rather one acquired from gatecrashing expedition. They discover the person they were tracking was here and is heading to the very pandora gate the expedition entered. Good place for the egocasting into case morph due to threat of being infect by unknown exsurgent threat, biological based. Upon find the gate, it is stuck open and when going to the other side they find the scientist in a ravine filled with an exsurgent hive. The gate is closed when they get back, but knowing the exsurgent could reopen it they need to disable it, effectively trapping them on the other side. Flesh out and tweak to your groups desires. Concepts: The exsurgent virus used in the lost station was a small experimental test, blacked out. Any egos on it besides the Lost were forks, and destroying to station would of drawn to much attention to Cognite post the lost project, so they let it 'disappear' and erased all data. The Exsurgent strain allowed for rapid growth of psi powers, but was hive-mind based. Anyone effect with it would strive to return to the hive after a length of time, overriding any other thought of the infected person. The reason the gate needed to be closed would be that the hive now knows how to operate the gate due to person returning to it. Largely a standard McGuffin chase.