User:SOTO/Forum Archive/The Reference Desk/@comment-7657843-20161112133450/@comment-20607870-20161112215438
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User:SOTO/Forum Archive/The Reference Desk/@comment-7657843-20161112133450/@comment-20607870-20161112215438 I believe that a spin off is a fictitious continuation of the series. Such as SJA, TW, K9&C, K9, Mindgame, Auton, P.R.O.B.E. and Class. To name a few on screen ones.
DW Confidential and DW Extra are behind the scenes programmes, documentaries... I'd try to avoid using spin off but that's just me.