* '''Celine Demon''' (a nickname used by the fans. See below for an etymology of this nickname)
* In a draft script for [[2.02]], Dean refers to it as the '''Big Bad'''.
== Appearances==
* [[1.01 Pilot (episode)|1.01 Pilot]] ''appears as figure next to Sam's crib''
* [[1.11 Scarecrow (episode)|1.11 Scarecrow]] ''[[Meg Masters]] communicates with him through the goblet of blood''
* [[1.16 Shadow (episode)|1.16 Shadow]] ''[[Meg Masters]] communicates with him through the goblet of blood''
* [[1.21 Salvation (episode)|1.21 Salvation]] ''appears as figure next to Rosie's crib''
* [[1.22 Devil's Trap (episode)|1.22 Devil's Trap]] ''possesses [[John Winchester]]''
* [[2.01 In My Time Of Dying (episode)|2.01 In My Time Of Dying ]] ''appears to [[John Winchester]] as a janitor in the hospital basement''
* [[2.09 Croatoan (episode)|2.09 Croatoan]] ''[[Duane Tanner]] communicates with him through the goblet of blood''
* [[2.21 All Hell Breaks Loose: Part One (episode)|2.15 All Hell Breaks Loose: Part One]] ''appears in a dream to Sam''
==Physical Form==
* [[1.22 Devil's Trap (episode)|1.22 Devil's Trap]] played by [[Jeffrey Dean Morgan]]
* [[2.01 In My Time Of Dying (episode)|2.01 In My Time Of Dying ]] played by [[Fredric Lehne]]
* [[2.21 All Hell Breaks Loose: Part One (episode)|2.15 All Hell Breaks Loose: Part One]] played by [[Fredric Lehne]]