General Science Multi-Clocking Device

The General Science Clocking Device, more commonly known as the TARDIS monitor was a device that was able to measure time, temperature and location all without the use of GPS. Supposedly, it was taken off shelves when customers began traveling back in time.

The Monitor and the Doctor
The Doctor claims he originally picked it up at a garage sale after a creepy old man told him that it had made his son disappear. The Doctor takes interest in these events and buys it. The rumors are true and he is pulled into 1956 within one day. It causes him to crash into the General Science Complex under Professor's Peak.

In 2050, Professor Justin modifies it to also be an artificial intelligence, which begins sending them to random points in time and space and keeps thinking that the "Mentally Unstable Professor is Being Possessed."