"Stephen Gallagher" is an England/English writer.

Gallagher was born in Salford, Greater Manchester. He has written several novels and television scripts, including for the BBC television series Doctor Who — for which he wrote two serials, Warriors' Gate (1981) and Terminus (Doctor Who)/Terminus (1983)—as well as for the series Rosemary & Thyme and Bugs (TV series)/Bugs, for two seasons of which he was script consultant along with Brian Clemens. He adapted his own novel Chimera for ITV Network/ITV and directed the adaptation of Oktober as well as writing the feature-length episode The Kingdom of Bones for the BBC series Murder Rooms.

He also developed and wrote a science-based series for ITV Network/ITV, Eleventh Hour (UK TV series)/Eleventh Hour, starring Patrick Stewart as a government science investigator and advisor. The programme was rumoured to be ITV's answer to the new series of Doctor Who, but was more in the tradition of the hard-science thriller. Gallagher's series format was acquired for a Eleventh Hour (U.S. TV series)/US television remake by the CSI: Crime Scene Investigation/CSI trio of CBS, Jerry Bruckheimer TV and director Danny Cannon. The series aired on CBS and starred Rufus Sewell and Marley Shelton.

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