An old Oxford University classmate and girlfriend of Mulder's asks for his help in investigating an international case in which several British dignitaries were executed. In their investigation, Mulder and Scully encounter an assassin who has the ability to start fires using only his mind.

Beavis and Butt-head watch the Yule Log and Christmas videos on TV.

To stablize his own timeline, Cable comes to the present to prevent Bishop from saving mutant-kind from Apocalypse's plague.

Mark's up to no good as he gets Jane to leak a story of the closure of Holby and Charlie's missing Duffy. A daughter can't cope with her father and abandons him in casualty but a guilty conscience makes her return where the staff decide she's the one who needs help. Tempers boil over in the kitchen when a restaurant manager trifles with the chef's sweetheart. And a bee sting brings a man to the verge of death when he and his son are stranded out in the middle of nowhere. Karen's having a hard time swotting for her exams.