Channel controller Julian Bellamy announced the 'Spooks' offshoot today at the launch of BBC Three's 2007 schedule.
Bellamy said the series titled 'Rogue Spooks' was currently in development and would concentrate on a secret unit within MI5.
David Wolstencroft, the writer of the BBC One series, is working on the new series with the original production team at independent TV company Kudos.
The commission comes after BBC Three scored a hit with 'Doctor Who' spin-off 'Torchwood', which attracted a peak audience of 2.4m viewers and was this week re-ordered for a second series.
Bellamy has also commissioned six new comedies including broadband-only show 'The Cowards' about four men who take over the BBC Three website and build their own comedy world.
In addition on the new schedule are 'Gavin and Stacey', a series about young love penned starring Alison Steadman and Rob Brydon, underworld comedy 'Thieves Like Us' and petty crook tale 'Smalltime'.
Comdienne Karen Taylor has also been handed her own series, 'Touch Me, I'm Karen Taylor', while other performers and writers will be showcased in 'Comedy Shuffle with Rob Rouse'.
The schedule also includes the return of Rob Brydon's 'Annually Retentive', 'Ideal' starring Johnny Vegas and Ash Atalla's sketch show 'Man Stroke Woman'. New factual additions include 'Sex Talk with Mum And Dad', where a Dutch sexologist helps parents discuss their children's sex lives, and one-off documentaries 'Lucy: Teenage and Transsexual' and 'My Big Breasts and I' as part of the Body Image season.
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