The Substitute (2007)

A new substitute teacher arrives in a sixth-grade classroom with ambitious plans to prepare her students for an international competition in Paris. However, her unconventional methods raise suspicions among the kids. They start to question her mind-reading abilities, her harsh demeanor, and how she manages to charm their parents into believing she's a perfect instructor. As the students band together, they uncover the shocking truth: their new teacher is actually an alien with a hidden agenda. Can they expose her before it's too late?