An in-vision commentary is a commentary in which the participants are filmed, and the resulting video dropped within the video of the episode on which they were commenting. This let the viewer divine extra meaning by reading the facial expressions of the participants as they speak. It also overcomes the occasional problem encountered on audio commentaries of participants making visual references. Such commentaries were a major feature of the series 2 box set, but they were not extensively used thereafter until the series 5 box set.
A form of "video commentary" was also later used on the official Doctor Who website, as a part of the Adventure Calendar series. These commentaries differed from the ones on the DVD boxset, in that they were simply recordings of the commentary participants; no footage from the actual episodes was included. Indeed, most of these "in-vision commentaries" were later repurposed as simple audio commentaries either in the podcast series of commentaries used in the RTD era or on the DVD box sets. Nevertheless, they were labelled "in vision commentary" on their respective title cards.
