Question: Born in captivity, what lion was introduced into the wild by conservationist George Adamson?

Context paragraphs:
Born Free: Born Free is a 1966 British drama film starring Virginia McKenna and Bill Travers as Joy and George Adamson, a real-life couple who raised Elsa the Lioness, an orphaned lion cub, to adulthood, and released her into the wilderness of Kenya.  The film was produced by Open Road Films Ltd. and Columbia Pictures.  The screenplay, written by blacklisted Hollywood writer Lester Cole (under the pseudonym "Gerald L.C. Copley"), was based upon Joy Adamson's 1960 non-fiction book "Born Free".  The film was directed by James Hill and produced by Sam Jaffe and Paul Radin.  "Born Free", and its musical score by John Barry, won numerous awards.

Supercub the Lion: Supercub was a male lion that was adopted as a cub from the Nairobi National Park Orphanage near Nairobi, Kenya.  In 1972, Supercub was a pride member with Christian the lion and other lions being cared for by conservationist George Adamson in the Kora National Reserve in Kenya.  The lion, whose personality was described as "boisterous" and "extroverted", was dubbed Supercub by Adamson.

Captive elephants: Elephants in captivity refers most often to elephants either born in captivity, such as a zoo, circus, or camp, or have been imported from the wild.  Most captive elephants are Asian elephants. Selective breeding of elephants is impractical due to their long reproductive cycle, so there are no domestic breeds.  African bush elephants and African forest elephants are less amenable to training.  There are estimated to be 15,000 to 20,000 elephants in captivity, of a total population of 40,000 to 50,000.  Historically, elephants in zoos and circuses were taken from the wild; today, many are born in captivity.

An Elephant Called Slowly: An Elephant Called Slowly is a 1969 Morning Star Productions Ltd. feature film starring Bill Travers and Virginia McKenna as themselves in a story about the couple's real-life adventures with three young African elephants while house-sitting in Kenya.  George Adamson (of "Born Free"), makes an appearance as himself.  The soundtrack features several well-known musical numbers by Bert Kaempfert.  The film was written by Travers and director James Hill, and has been released to VHS and DVD.

Tony Fitzjohn: Anthony Raymond Fitzjohn, OBE is a conservationist who worked extensively with George Adamson at Kora in Africa.  In recognition of his service to wildlife conservation, Fitzjohn was appointed an Officer of the Order of the British Empire in 2006.

George Adamson: George Adamson MBE (3 February 1906 – 20 August 1989), also known as the "Baba ya Simba" ("Father of Lions" in Swahili), was a British wildlife conservationist and author.  He and his wife, Joy, are best known through the movie "Born Free" and best-selling book with the same title, which is based on the true story of Elsa the Lioness, an orphaned lioness cub they had raised and later released into the wild.  Several other films have been made based on Adamson's life.

Elsa the lioness: Elsa ( 28 January 195624 January 1961) was a Kenyan Masai lioness raised – along with her sisters "Big One" and "Lustica" – by game warden George Adamson and his wife Joy Adamson after they were orphaned at only a few weeks old.  Though her two sisters eventually went to the Netherlands' Rotterdam Zoo, Elsa was trained by the Adamsons to survive on her own, and was eventually released into the wild.

Christian the lion: Christian the lion was a lion born in captivity and purchased by Australian John Rendall and Anthony "Ace" Bourke from Harrods department store in London in 1969.  He was later reintroduced to the African wild by conservationist George Adamson.  One year after Adamson released Christian to the wild, his former owners decided to go looking for him to see whether Christian would remember them.  He did, and with him were two lionesses who accepted the men as well.

To Walk with Lions: To Walk with Lions is a 1999 film starring Richard Harris as George Adamson and John Michie as Tony Fitzjohn.  It follows the later years of wild game preserver/naturalist Adamson.

Kampi ya Simba: Kampi ya Simba is a settlement in Kenya's Rift Valley Province.  It was home to George Adamson for many years.  Kampi Ya Simba is located in Kora which is where George Adamson released many of his lions

Supporting paragraphs: Supercub the Lion Christian the lion
Answer: Christian the lion