Briggs has done voices for several NuWho monsters, notably the Daleks and the Cybermen. He also voiced the Nestene Consciousness in the 2005 episode Rose, the Jagrafess in The Long Game, the Judoon and the Ice Warrior Skaldak in Cold War. He also does a Ninth Doctor impression in the Ninth Doctor Chronicles, and plays literally every background character in the audios if they only have like one line.