Theresa Cassidy was unaware that she is the daughter of the X-Man known as Banshee. She was in the care of a human man and they were herded into a train to be shipped off to a slave camp to be terminated. The train was stopped by the Outcasts, a band of mutants who traveled the ruins of America led by the mutant inventor known as Forge. The Outcasts saved Sonique and the others from certain death.
