Sound creature

The Sound Creature is an entity inhabiting an alternate universe. It is unknown what it exactly is. It's physical form is that of a huge ameoba. It learns very fast and comunicates through rhythm.

Fiction
When the Doctor and Charley Pollard were stranded in an alternate universe, & were immediatley assaulted by sensory deprivation. they were blinded, could not taste or smell, and could only feel each other's hands. The only sense that is working is hearing. After walking for a while, they hear the TARDIS, which had supposedley been destroyed, materializing. however, this was just the Creature manifesting itself for the first time, using the first sound the pair had made in this universe. After the Doctor and Charley fight over what the noise was, Charley trips over an alien body. Soon, the light fades & their senses return. They hear a very faint "help me!". Charley thinks it's the body, but the Doctor says it's long dead, and it can't be reflexes. The "help me!" 's continue in a seemingly random pattern, until the Creature releases a cacophany that greatly frightens Charley. The Doctor scolds it, but then the light returns. After Charley was humming to pass the time, the Doctor tells her to stop it. After a long silence from the Doctor, they both realize that the way time moves in the Creature's universe is different. They have been walking for over 2 weeks. Then, after a long silence, the Creature repeats Charley's humming. The Doctor at first thinks it's Charley, but then realizes it's someone-or something-else. The Creature then bombards them with random snippets of their conversations, then fires off another cacophany. After this, the light fades, and both realize they need to eat the dead bodies they keep finding in various states of advancement. The Sound Creature, in Ameoba form, attacks the doctor, but Charley subdues it. Afterwards, the Doctor and Charley continue their trek through the light. Every once in a while, the creature put on a show with it's "Music", really unintelligible noise. However, it gets better and better at putting together pieces. After the doctor and Charley's hands fuse into one, and they combine into one, the creature visits them in the other's form. it tries to convince them to give it full life by giving up theirs, but they resist it, and with a last Cacophonous scream, it is once more reduced to "help me!" until it finally faded. Never to be heard again. (BFA: Scherzo)