Ep 4. Transformation - Secondary Mutation

The X-Men destroy the U-Men's hideout. Emma's body transforms into a diamond-like consistency as she tries to protect Hisako from a laser beam fired by the dying Todd. This is known as "secondary mutation" amongst the Mutants. The X-Men decide to take Emma and Hisako back to the Xavier Institute for examination. During the flight back, the Blackbird is attacked by a strange bat-like creature who shows the dangerous symptoms of Damon-Hall Syndrome, which can attack those with secondary mutations.