white knight

noun
1.
a hero who comes to the rescue.
2.
a beleaguered champion who fights heroically for a cause, as in politics.
3.
Informal. a company that comes to the rescue of another, as to prevent a takeover.

Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
white knight
 
n
a champion or rescuer, esp a person or organization that rescues a company from financial difficulties, an unwelcome takeover bid, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Kodak's stock rose accordingly in anticipation of a white knight around the
  corner.
Smart businesses will grab the chance to play the role of white knight.
But he maintains that his emergence as a whistle-blowers' white knight was
  anything but calculated.
But an unlikely white knight happened to live next door.
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