The Stretchy Facility originated in the "Gmod SCARY & FUNNY HORROR INVESTIGATION Map! (Garry's Mod)" video.
The Random Prisoner was an unnamed prisoner.
Pocket Dimension Combine Soldier
It is unknown if he is actually a prisoner or guard. His pocket dimension may be a cell, or a security office.
Role Play Universe Venturian
Venturian was placed inside a padded cell. He joined the duo for a short time, before being murdered by Johnny Ghost for standing in his way.