Also known as "MI-5".

A high octane two-part feature-length special launches the return of critically-acclaimed Bafta, RTS, TRIC and Broadcast award-winning Spooks for a new season this autumn on BBC ONE.

MI5's crack team of spies was left reeling after the shocking death of Danny at the hands of hostage-takers at the end of last series.

Now Adam (Rupert Penry-Jones), Harry (Peter Firth), Ruth (Nicola Walker), Fiona (Olga Sosnovska) and rising star Zafar (Raza Jaffrey) set out to become even stronger in their battle to safeguard the nation at a time of unprecedented danger and unexpected threats.

Season 4 - E pisode 3:

When high profile MP William Sampson (Rupert Graves) crosses the floor to join the British Way, a far right political party, MI5 must take extreme action to stop the group winning their first parlimentary seat. With racist attacks spiralling out of control, Adam goes undercover to destroy the organisation from within, but will he achieve his goal before his cover is blown and his life endangered? Also guest starring David Threlfall
Initital broadcast - 15th September - BBC 3.
Nationwide broadcast - 22nd September - BBC 1.

©2005 BBC Worldwide.