"Christmas Carol" is the first Christmas-themed episode of the FOX series The X-Files, product and aired as the sixth episode of its fifth season.
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On her Christmas vacation with her brother's family, Scully receives a mysterious phone call from a familiar voice who says, "She needs your help. Go to her." The call needs Scully to a murder case where the victim's three-year-old adopted daughter bears an uncanny likeness to her sister, Melissa, at that age. The emotional roller coaster that follows has Scully believing that her sister had a baby during a period when she traveled the country and she tries to adopt the child, knowing that caring for her would change her life.