Just Another Day: Christmas Special
From FreeSpace Wiki
Even the Shivans need to be remembered on Christmas.
Just Another Day: Christmas Special is the fourth installment in the Just Another Day series, a popular FreeSpace parody similar to the Deus Ex Machina campaign. This series was created by FREDer Axem and the series was published to the HLP forums. This campaign is bundled with the JAD special edition.
The Christmas Special more or less disregards the previous (however sparse) continuity. Consisting only of one mission, the Special has no place in previously valid chronology, and should be played, as said by Axem, "At least after JAD 1".