A poster referencing, among other things, reflection. (TV: School Reunion)
Dr Chin Lee told Kate Stewart that her mother said that evil did not like its own reflection. (AUDIO: Open the Box [+]Error: Code 2 - no data stored in variables, cache or SMW.) This was indeed the case with the Mara. (TV: Kinda [+]Christopher Bailey, Doctor Who season 19 (BBC1, 1982).; AUDIO: The Cradle of the Snake [+]Marc Platt, Main Range (Big Finish Productions, 2010).)
By 2007, a poster in a classroom at Deffry Vale High School referenced, among other things, reflection. (TV: School Reunion [+]Toby Whithouse, Doctor Who series 2 (BBC One, 2006).)
The female Saturnyns hid themselves on Earth using perception filters. However, this technology did not hide their reflections. Since brains could not process the two conflicting pieces of information, they had no reflections in mirrors. (TV: The Vampires of Venice [+]Toby Whithouse, Doctor Who series 5 (BBC One, 2010).)
Soon after regenerating, the newly-born Second Doctor briefly saw his preceding incarnation in his reflection, (TV: The Power of the Daleks [+]David Whitaker, Doctor Who season 4 (BBC1, 1966).) due to a quirk of Gallifreyan optics. (AUDIO: The Power of the Daleks [+]Error: Code 2 - no data stored in variables, cache or SMW.)
During the Siege of Trenzalore, the Eleventh Doctor trapped a Weeping Angel by forcing it to look at its own reflection. (TV: The Time of the Doctor [+]Steven Moffat, Doctor Who Christmas Special 2013 (BBC One, 2013).)
When the First Doctor, Susan Foreman and Stoyn met the Archaeons, they initially mistook the creatures' globular surface for a reflection only to understand that they creatures were communicating with the Time Lords using their own images. The First Propagator subsequently adopted Stoyn's reflection to communicate with the Time Lords. (AUDIO: The Beginning [+]Error: Code 2 - no data stored in variables, cache or SMW.)
In 2017, Heather discovered a puddle of sentient oil, quickly deducing it was not an ordinary puddle due to her reflection not being horizontally reversed. (TV: The Pilot [+]Steven Moffat, Doctor Who series 10 (BBC One, 2017).)
