Fan Casting "I'll be keeping an eye on you, Professor." in X-Men: First Class (2011)

In the aftermath of Magneto's attack in Washington D.C, Professor X is met by Nick Fury and Phil Coulson at the mansion. They talk about the recent events that have occurred such as Tony Stark publicly revealing himself to be Iron Man, the battle between the Hulk and Abomination in Harlem, and the events in Puente Antiguo. Nick asks Charles if Magneto told him where he was going but Charles denies. Before Fury leaves, he ask Charles to keep his team in check and that he'll be watching him.