Marita Covarrubias is introduced as an informant to Fox Mulder (David Duchovny) after the death of his former source, X (Steven Williams). X scrawls the letters "SRSG" in his own blood as he dies, leading Mulder to the Special Representative to the Secretary-General of the United Nations. Covarrubias uses her diplomatic connections to help Mulder infiltrate the Russian province of Krasnoyarsk, allowing him to reach the site of the Tunguska event. However, it is later seen that Covarrubias is working for The Smoking Man (William B. Davis) and the Syndicate.