Yes there is a part in Auravision 4 when Foxglove and his friends find themselves up against The Great Old One, Cthulhu. For those who don't know, Cthulhu is from the Cthulhu Mythos written by HP Lovecraft.

Anyway this is a bit of a stripped n version of him, appearing to them as part of a dream sequence. Even though he is merely an illusion "Thulie" is still a bit much for Foxglove, Loleatta, Alister, Crimson and Mikau to handle.