Sneak Peek 1: http://www.spoilertv.com/2012/11/glee-episode-407-dynamic-duets-sneak.html

Sneak Peek 2: http://www.spoilertv.com/2012/11/glee-episode-407-dynamic-duets-sneak_19.html

Sneak Peek 3: http://www.spoilertv.com/2012/11/glee-episode-407-dynamic-duets-sneak_21.html