Parallel universe (What If the TARDIS was a BICYCLE made for two not a POLICE BOX?)
From Tardis Wiki, the free Doctor Who reference
In a parallel universe, the Doctor travelled through the Time Vortex with Rose Tyler and K9 on his TARDIS, which took the form of a two-seated bicycle. (PROSE: "What If the TARDIS was a BICYCLE made for two not a POLICE BOX?" [+]Part of Time Warped!, Loading...{"namedpart":"What If the TARDIS was a BICYCLE made for two not a POLICE BOX?","1":"Time Warped! (feature)"})
