In season four, The X-Files continued to expand the breadth and complexity of the mythology established in the previous two seasons while developing a deeper, romantically ambiguous relationship between its photogenic leads, FBI Special Agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson). New players such as United Nations official Marita Covarrubias and virus-carrying bees joined familiar faces like Cigarette Smoking Man, Alex Krycek, the blockheaded Alien Bounty Hunters, and the Consortium in the growing cast of a global struggle involving multiple factions of alien forces. It was a season in which Mulder and Scully seemed to lose ground to the global forces surrounding them, in which Mulder was infected with the black oil and Scully discovered she had cancer. With even the loyalties of Assistant Director Skinner and Mulder's mother in doubt, Mulder and Scully learned to trust only each other in their pursuit of the truth.  (12**)