Beware the terrifying tentacles!

What hideous horror is lurking behind Tabby?

Warning: This scene contains alien tentacles - if you're easily scared, have a cushion ready to hide behind before pressing play.

Tabby needs a moment alone to gather her thoughts. But wait, what was that sound behind her?

A tentacle rises up. Then another.

Blaster at the ready... Get ready to turn around and blast.

What kind of monster has tentacles like that?! CBBC can barely look.