Who plays summer on young and the restless?
No context provided
Who has played Summer on Young and the Restless since 2012?
Hunter King
No context provided
Who played Summer on Young and the Restless only in 2012?
Lindsay Bushman
No context provided
Who played Summer on Young and the Restless from 2009-2012?
Samantha Bailey
List of The Young and the Restless characters
https://en.wikipedia.org/wiki/List%20of%20The%20Young%20and%20the%20Restless%20characters
On May 11, 2012, it was announced the Lindsay Bushman had been cast in the role of the teenage Summer. 
Summer Newman
Bushman's tweet in response to her firing hinted that she would be replaced by Hunter King formerly of Hollywood Heights, which was also run by Griffith and Phelps.
Summer Newman
The character, Summer on The Young and the Restless has been played by several actresses. Samantha Bailey played Summer on Young and the Restless from 2009-2012. On May 11, 2012, it was announced the Lindsay Bushman had been cast in the role of the teenage Summer. Bushman's tweet in response to her firing hinted that she would be replaced by Hunter King and King has been playing the role since 2012.