Task: Text Simplification
Input (English): they would later return to the revived series in the 2008 christmas special " the next doctor " , introducing two new variants of the race ; the cyber-shades and the cyber-king.
Output (English): they would later return to the running again series in the 2008 christmas special " the next doctor " , introducing two new types of the race ; the cyber-shades and the cyber-king.