10 Most Powerful X-Men Villains

We all know that Charles Xavier is the most powerful telepathic mutant around, but while he's a good person, who uses his power to help people, he has a shadow, and she's his exact opposite. Cassandra Nova was born at the same time as Charles, but without a body, as she is a mummudrai, a parasitic lifeform born on the astral plane.

She was born with the ability to copy DNA, so she copied Xavier's, and she used this to create her own physical body. This made her Charles' twin sister, through a roundabout sort of comic book logic kind of way, and she attempted to stranger her 'brother' in the womb with his umbilical cord.

Charles defended himself with a psychic blast, resulting in Cassandra's death, and she was stillborn. She managed to survive and rebuild herself to become one of Charles' most deadly enemies. Her powers are vastly more dangerous than his own, and she represents a clear and present danger to everyone in the Universe.

As a mummudrai, she possesses telepathy, telekinesis, spontaneous cell regeneration, DNA duplication, intangibility, shapeshifting, immunity to magic and magical mimicry, premonition, mind control, dematerialization, and she can create cosmic fire and control it.