Mary Ellen was visiting Xavier as a prospective student, touring the school with a friend. Her tour involved a dorm room party, which happened to be Casey's! They met and Mary Ellen introduced herself as "Alice," a foreign exchange student from London, with one beautiful accent. Casey fell head over heels for Alice. When the night ended, the secret was up and Mary Ellen revealed her true self. Four months later Mary Ellen attended Xavier as a freshman and the rest is history. Casey only gets to see Alice every so often after a few drinks (rumor has it, she might be at the wedding).