Well in English, when you want to pluralize something it depends on the type of word and its roots. But for acronyms and abbreviations you just slap an S on the end. Unless the word ends in an s in which case you slap es on the end. So presumably it would just be TARDISes.
Consequently, that explanation also answers the second point.
Well in English, when you want to pluralize something it depends on the type of word and its roots. But for acronyms and abbreviations you just slap an S on the end. Unless the word ends in an s in which case you slap es on the end. So presumably it would just be TARDISes.
Consequently, that explanation also answers the second point.