The final week of battles begins! Christina Aguilera, Blake Shelton, CeeLo Green and Adam Levine return to the stage for a series of do-or-die duets among their remaining team members. Blake and Christina still have one steal remaining. Once again, Mary J. Blige, Michael Buble, Rob Thomas and Billie Joe Armstrong join the coaches to help mentor the aspiring artists. With the live shows approaching, everything is on the line this week.