According to classified documents from the Police Observations Recording The Alter Levels (P.O.R.T.A.L.), there has been increased portal activity between Earth and the Otherworld. Records include the first documented portal activity from 2000, accounts from survivors, and rare images of traveling through portals and the Otherworld itself. P.O.R.T.A.L. closely monitors three creatures - the Stalker, Banshee, and Sorcerer - that pose major threats. Recent images suggest an invasion by these Otherworld creatures may be underway. Civilians are warned to avoid portals and contact P.O.R.T.A.L. if any activity is witnessed.