Obi Wan Kenobi
Besides the party, he is the only person to escape from the cultists clutches. He did not escape unscathed. Mentally, he appears unfit. He refers to himself “Obi Wan Kenobi” and sometimes as “Master Kenobi” and warns of the impending invasion by the Klingons.
All the electronic scans that CTU has run on him show that his brain is functioning normally.
He escapes from his cell regularly, but they don’t know how. When he does this he wanders around CTU HQ for a while, then he goes back to his cell.