Ex-President was a video short by BBV Productions, exclusive to the P.R.O.B.E. Case Files - Volume 2 DVD release. Written by James Hornby, it was the second and final P.R.O.B.E. short to feature a licensed appearance by Faction Paradox after Daylight Savings. It also brought in the character of Felix Mather, used with Lance Parkin's permission, and sought to resolve the contradiction between his depiction as President of the United States in the 2010s and the real-world election of Barack Obama.
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- This story continues the Faction Paradox plotline which began in Daylight Savings and would have been concluded in the unproduced Case File Faction Paradox.
- The story was advertised as featuring the "first live-action appearance" by Faction Paradox, but this was only in the form of a short, non plot-relevant cutaway at the beginning of the episode; for most of the story, the only live-action footage depicted Giles, as usual for the P.R.O.B.E. Case Files, and images of Faction Paradox members were static illustrations with voiceover narration from Giles.
- Jonathan Dennis's short story Hanging Chads, published in the charity anthology Walking in Eternity and later referenced in Head of State, previously suggested that Faction Paradox was responsible for the uncertainty in the outcome of the 2000 United States presidential election.
- Felix Mather was originally President of the United States in the early 2010s. (PROSE: Trading Futures, Father Time) In a new version of history, Barack Obama was President instead. (TV: The End of Time)