Roboform Christmas tree

The Robotic Christmas Trees were used by the Robot Santas to wreak havoc among Earth during the two christmas invasions. These remote-controlled trees can spin at extremely high speeds and rip apart everything in their path. Another feature the trees have is to send bombs disguised as baubles flying everywhere. (DW: The Christmas Invasion, The Runaway Bride) These baubles were used by the Doctor to decimate the Empress of the Racnoss and her children.