Tethered Aerial Release Developed In Style

The Tethered Aerial Release Developed In Style (abbreviated TARDIS), unlike its namesake, was a hot-air balloon owned by Jackson Lake while he was under the impression he was the Doctor. Though the Tenth Doctor was surprised and disappointed by it at first, he would later find it to be nothing short of sheer brilliance that Jackson Lake already possessed.

When piloted by the Tenth Doctor, Lake's "TARDIS" was key in the destruction of the CyberKing. (TV: The Next Doctor)