|Dates||?-2010 (Deceased; human killed by Alpha Vampire, demon killed by Dean)|
|Episode(s)|| 6.01 Exile on Main St.|
6.02 Two and a Half Men
6.07 Family Matters
6.10 Caged Heat
Christian Campbell is a hunter, and a third cousin related to Sam and Dean's mother Mary's side of the family. It is revealed in 6.07 Family Matters that he has been possessed by a demon for some time, and because his neck was snapped by the Alpha Vampire, it is likely that he is dead though his body is still possessed. He is later released from his possession in 6.10 Caged Heat when Dean stabs him with Ruby's Knife, killing both him and the demon.
When Dean is attacked by a Djinn, Sam rescues him and reveals he has been back from Hell for a year and hunting with cousins Gwen Campbell, Christian Campbell, Mark Campbell and grandfather Samuel Campbell. The Campbells go back to the house Dean is sharing with Lisa and Ben to catch the Djinn, but when they realize the Djinn are watching the house, Dean suggests they need to leave so the Djinn will attack. During the attack, Christian helps Samuel to trap the female Djinn, Brigitta, and loads her in their van.
Christian is at the compound with Samuel, Mark, and Gwen when Dean and Sam arrive with the baby Shapeshifter. According to Samuel, Christian and his wife, Arlene, have been trying for a baby. Christian agrees to take in and raise the baby shapeshifter, over Dean's complaint that he "shouldn't be raising anything", but the Alpha Shapeshifter appears, overpowers them, and takes the baby back.
Dean doesn't entirely trust Samuel, but, when he tries to break into his office, Christian waylays him and they trade insults and threats. Christian attempts to discourage Dean from coming on the mission to get the Alpha Vampire by telling him that "accidents happen," but Dean ignores the threat, and it is on the mission that Dean sees Samuel, Sam, and Christian load the Alpha vampire into a van. Sam tells Dean that the Campbells have been capturing some creatures for the sake of interrogation, and Dean resolves to follow them to where Samuel is holding the Alpha. Dean and Sam manage to talk to the Alpha vampire but are eventually discovered, and Samuel, Christian, Gwen, and another hunter hold them at gunpoint and force them to disarm.
When the Alpha vampire escapes, it snaps Christian's neck, but when it is distracted with Sam, Christian comes up behind it and injects it with dead man's blood. Christian's eyes are black, and several more demons show up and take the Alpha away with them, leaving just Dean, Sam, Samuel, Gwen, and Crowley. Crowley reveals that Christian has been possessed for a while and serving as his mole, and that Samuel has been working for him, gathering high-ranking creatures and trying to learn the location of Purgatory because Crowley is interested in "developing" it.
The demon now works at Crowley's side in a disused prison where they torture and interrogate all the creatures the Winchesters bring them for information on Purgatory. He encounters Meg, a demon still loyal to Lucifer, trespassing in a corridor and incapacitates her. Christian has her strapped naked to a torture table and begins slicing her with Ruby's Knife, demanding to know "everything". She is unimpressed by his methods, stating that her vessel has seen worse treatment, to which Christian answers by escalating her torment. Meg suddenly starts laughing and when Christian asks why, Meg tells him that it's because Dean is right behind him. At that moment, Dean grabs Ruby's Knife from Christian and stabs him through the back, killing him.