The mentally, twisted professor Lizzie was known for loving all types of lizards. She loved lizards so much, she created a serum with a difficult formula that transformed her into a lizard, or so she thought. Professor Lizzie had thought she perfected her serum there was no need for a test trial. The professor felt the transformation begin, she felt her skin get hard and her blood turned cold. When she looked in the mirror, she could not believe her eyes she had turned into a crocodile, not just any crocodile a purple crocodile. The professor was never heard of.
Nice twist. Check for run on sentences. Also, the first Lizzie should be capitalized.