Time Projector

From Tardis Wiki, the free Doctor Who reference

An Artari Time Projector was a device resembling an ordinary video projector, and which could project translucent, hologram-like visions of events which had occurred at its current location in another time-zone, giving the appearance of a ghost.

One such device found its way to 2019 Earth, where it was bought on eBay by the stage manager of the London Palladium theatre under the mistaken belief that it was a prop. After it was installed on stage, it caused several a Victorian woman to appear midway through live performances several times over the course of a week, with these manifestations being mistaken by actual ghost sightings by some viewers. P.R.O.B.E. learned of the ghost sightings via intercepted text messages and succeeded in identifying and deactivating the Time Projector, which they packed up and brought back to P.R.O.B.E. HQ. They were unsettled, however, by the fact that the Shadow People observed them throughout the investigation, despite ostensibly not being responsible for the Projector's presence. (WC: Shadow People [+]Loading...["Shadow People (webcast)"])

An image of the Projector was seen amidst other P.R.O.B.E. paraphernalia in a video message left to Sir Andrew Williams on the Preternatural Research Bureau Online Database. (HOMEVIDA Message From Sir Andrew [+]Loading...["A Message From Sir Andrew (home video)"])