Info beyond the first appearance needs to be added
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The Scream, wanting to be remembered, used the Eleventh Doctor's and Alice Obiefune's memories to form a "new creation". He intended to take over the Sapling, to be able to cover entire planets. This way, no one would be able to turn his back on him, which meant he would always be remembered.
However, Alice materialised the TARDIS around the Scream and his machine, stopping the process in the middle. The Sapling became a individual, sentient being, containing both the Doctor's and Alice's memories. Because he had the memories of a Time Lord, he was aware of being predisposed to genocide. He asked the Doctor to destroy him, claiming this would be the safest thing to do. (COMIC: The Scream)