also featured within the gameplay of a number of popular video games, including Lego Dimensions and Fortnite: Battle Royale. Other references to the TARDIS have included a $2 silver commemorative coin depicting the TARDIS, issued on Niue Island in the South Pacific Ocean by the Perth Mint to mark the 50th anniversary of the Doctor Who'' television show; and Tardis Environmental, a British sewage company, in reference to the similarity of their portable toilets to a police box. See also Time travel in fiction Creative geography Portable hole Pocket universe Footnotes Notes Citations References External links TARDIS sound effect from the current series (MP3) "The History of the TARDIS Prop" "Everything You Need to Know About the TARDIS" Fictional elements introduced in 1963 Bioships Doctor Who devices Telephony in popular culture Time travel devices Fictional spacecraft