Roboform Christmas tree

The Roboform Christmas trees were used by the Roboforms to wreak havoc on Earth during the two alien invasions that took place on Christmas in 2006 and 2007.

Characteristics
These remote-controlled trees could spin at extremely high speeds and rip apart anything in their path with its razor-sharp leaves. They could also play songs such as "Jingle Bells". (TV: The Christmas Invasion) Additionally, the trees sported remote-controlled bombs disguised as baubles, (TV: The Runaway Bride) potentially fatal mistletoe which fed on the nutrients of other lifeforms, and tinsel which could restrain humanoids. (PROSE: The Christmas Inversion)

History
A Roboform Christmas tree nearly destroyed Jackie Tyler's flat shortly before the Sycorax invasion of Christmas 2006. It was neutralised by the newly regenerated Tenth Doctor. (TV: The Christmas Invasion)

However, malicious mistletoe and tinsel accompanied the tree at Jackie's flat. On 25 December, parasitic mistletoe attacked the Third Doctor for his nutrients when he visited Jackie's home, but was distracted by a Christmas pudding and a bottleful of brandy by Jackie. Later, was captured by tinsel within the flat before being freed by the Doctor. (PROSE: The Christmas Inversion)

In 2007, the baubles of another Christmas tree were used by the Tenth Doctor to flood the web containing the Racnoss children with the River Thames. (TV: The Runaway Bride)

A tree was later used by a Changeling under the influence of the Roboforms. (WC: )