The TARDIS Cloister Bells often chime, but always with good reason.

The sound chimes as a warning to the Doctor of the Tremas Masters attempts to almost destroy the universe.

The Cloister Bells only ring a few times inDoctor Whos classic era.

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Even still, after this, there are many other instances of the iconic noise.

Unfortunately, the Doctors incapacitated state makes it hard for him to investigate the reason for the bell.

Shaken by the clear premonition,the Doctorretreats to the TARDIS.

A custom image of Matt Smith as the Eleventh Doctor and David Tennant as the Tenth Doctor in front of the TARDIS in Doctor Who.

Custom image by Milica Djordjevic

The Cloister Bells chime as a sign that the Tenth Doctors time in Doctor Who is up.

The Cloister Bells chime asa sign that the Tenth Doctors time in Doctor Who is up.

William Hartnell and Matt Smith in Doctor Who

Doctor Who