W.D. Gaster is a hidden, mysterious figure in Undertale, the 2015 role-playing game by Toby Fox, known as the former Royal Scientist who was shattered across time and space. Because he is rarely seen and often linked to glitches, broken dialogue and sudden absences, fans associate him with unstable digital sounds and vanishing effects. This clip draws on that reputation rather than a single scene, and it has spread through Undertale edits, fan animations and meme videos where a character needs to disappear without explanation.