|“||How dare you. We're nothing like the Slitheen. We're much, much worse||„|
Tree Lorn Acre Slitheen-Blathereen is the husband of Leef and one of the main antagonists of The Sarah Jane Adventures episode The Gift. He along with his wife at first seem friendly and claimed to be peaceful Blatereen but were in fact Slitheen-Blathereen, a Raxacoicofallapatorian family that were created when members of the Slitheen Family and members of the Blathereen Family intermingled. Tree and Leef looked down on their Blathereen relatives, seeing them as weak and instead took after their villainous Slitheen relatives.
He and his wife acted as bounty hunters and captured two Slitheen members before giving Sarah Jane Smith a plant called Rakweed which they said could survive the harshest conditions and could save millions of lives and end Earth's famines. However this was part of Tree and Leef plan to turn Earth into a Rakweed farm as they were addicted to the plant. But it was later revealed that the plant had a weakness: Ringing noises so thus came in handy for Sarah Jane and the gang to defeat the two. Sarah Jane's computer Mr. Smith causes ringing noises which causes the Rakweed in Tree and Leef's stomachs to be destroyed causing a build up of gas inside the two making them explode leaving nothing but their slimy remains.Clyde Langer called this farting themselves to death.
He is voiced by Simon Callow (who also played Fox).
- Tree is the second character Simon Callow has portrayed in the Doctor Who universe. The first being Charles Dickens in the Doctor Who episodes "The Unquiet Dead" and "The Wedding of River Song".
- Tree, along with Leef, was originally going to be a member of a Raxacoricofallapatorian family called the Rackateen, but for reasons unknown, this idea was scrapped and he became a Slitheen-Blathereen.