The protagonists for most of this series are Colonel Emily Chaudhry, Lieutenant Will Hoffman and Colonel Robert Dalton. Hoffman and Dalton are killed in the third instalment, ' (2005). The fourth play, ' (2005), features this universe's version of Brimmicombe-Wood, and is revealed to have been the commander of ICIS all along, and working to destroy UNIT from within. The short story "The Terror of the Darkness" in the collection ' (2005) reveals that Chaudhry and Hoffman had previously travelled with the Sixth Doctor. Their adventures then continue in "Incongruous Details" in ' (2006) before ending in "" (2008).