Although Cartmel was interested in working with the writer again, Delta and the Bannermen proved to be Kohll's only involvement with Doctor Who, although he was later contacted about the 1996 revival of the series, coproduced by the BBC and Universal Television.
Kohll's most famous project was as one of the producers of the film The 51st State starring Samuel L. Jackson and Robert Carlyle.
Other producer credits include 'Surviving Evil' starring Billy Zane and Natalie Mendoza, 'Chemical Wedding' by Iron Maiden front man Bruce Dickinson and starring Simon Callow, 'Secret Society' by director Imogen Kimmel and 'Julia's Ghost' directed by Bettina Wilhelm and written by Jane Corbett.
The film is to be directed by Academy-Award winner Marleen Gorris and relates the true story of Dr James Miranda Barry, the first woman doctor, forced to masquerade as a man.
In addition Malcolm is adapting two South African thrillers, by Margie Orford (Blood Rose) and Deon Meyer (13 Hours), for director Roger Spottiswoode.