Invisibility was the power or condition of not being seen by other beings.
Marcie Ross watches as her hand fades
Certain beings could be rendered unseen while others were just merely taken out of the perception of specific beings.
Cases
Scientific
- The Hellmouth in Sunnydale could impose invisibilitiy to certain individuals like Marcie Ross who was perceived that way via quantum physics.
- The trio invented an invisibility ray. However, the after effects of being turned invisible included the destruction its molecular structure.
Demonic
- Vocah could turn invisible at will.
- Der Kindestod was invisible to all but the sick.
- The Thesulac Demons and Pockla Demons could turn invisible.
Magical
- The affects of Gachnar's spell caused Xander Harris to be invisible to his friends.
- Tara Maclay incidentally made a group of Lei-Ach Demons invisible casting a spell that prevented the Scooby Gang from seeing demons.
- Rack had his residence cloaked and was only detectable by a vampire or a witch through a rise in ambient temperature
- Willow Rosenberg casted a spell to make Buffy, Xander and Dawn unable to see her and vice versa.
Other
- The ghost Maude Pearson could make herself invisible to some while her son could not take physical form.
- The First could choose who to appear to and remain unseen and unheard by others.
Invisible Individuals
- Marcie Ross
- Invisible students
- Der Kindestod
- Vocah
- Xander Harris (temporarily, twice)
- "Baby" and his friends (temporarily)
- Spike (temporarily)
- Buffy Summers (temporarily, twice)
- Warren Mears (temporarily)
- Jonathan Levinson (temporarily)
- Andrew Wells (temporarily)
- The First Evil
- Willow Rosenberg (temporarily)
- Dawn Summers (temporarily)
- Shy Girl (temporarily)