What he knew of her suggested she would leap at the chance to hunt an unknown creature, especially if it was dangerous.

Later that night, Richard has a nightmare where he is being chased through a field by an unknown creature.

At the same time, the unknown creature made sounds that seemed terrified and fear struck.

He tells them that the damage was caused by a creature unknown to science.

He could practically feel the unknown creature floating in his blood.

The Shadow remained, as always, an unknown creature of darkness.

He kept walking, and the unknown creature followed them.

The Shadow was gone, and in his place these unknown creatures of evil had arrived.

Historically, many unknown creatures have come to light purely by accident.

He concluded that the film depicts a genuine unknown creature.