A sub-series is simply a series that is entirely part of another series. If every entry in series B is also an entry in series A but the reverse is NOT true (i.e. series A also contains many entries that are not part of series B), then series B is a sub-series.
- The Videssoos series by Harry Turtledove includes the Tale of Krispos and Time of Troubles subseries and a sub-series called The Videssos Cycle.
- Math Net is a sub-series of Square One TV.
- Old vs. New and Raiders of the Story Arc are sub-series within the Nostalgia Critic series.
- commodoreHUSTLE is a sub-series of LoadingReadyRun. Friday Nights is arguably a sub-series of commodoreHUSTLE.
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