Futher Adventures of Cyclops and Phoenix

London, England, 1859: Nathaniel Essex has been transformed into the wicked Mr. Sinister. Cyclops wishes to kill him for what he will become, especially in terms of manipulating the Summers bloodline. But Jean convinces him that killing Sinister is not the answer – instead, they should focus on stopping Apocalypse. However, despite their intentions, they still must fight Sinister, which leads to the destruction of the sewer’s ceiling. Sinister recognizes that he is not yet strong enough to combat two mutants he would rather have as his allies. Therefore, Sinister flees, leaving Cyclops and Phoenix to escape the sewers as well before getting crushed by the falling debris.