When Peter Capaldi makes his full episode debut as the Time Lord in Doctor Who, it will be clear to many fans that the good Doctor has changed immensely, as we can see in the new trailer for Season 8.

This latest sneak peek gives us a better look at the massive dinosaur in the season premiere "Deep Breath", who was previously teased in the full-length trailer from last month. The premiere follows the doctor and his companion Clara (Jenna Coleman) as they travel to Victorian London to stop this dinosaur roaming in the Thames River, along with a string of mysterious deaths by spontaneous combustion. Take a look at the new footage before Doctor Who kicks off its new season on BBC One and BBC America on Saturday, August 23.

When the Doctor arrives in Victorian London, he finds a dinosaur rampant in the Thames and a spate of deadly spontaneous combustions.

Who is the new Doctor and will Clara's friendship survive as they embark on a terrifying mission into the heart of an alien conspiracy? The Doctor has changed. It's time you knew him.

Doctor Who Season 8 begins on Saturday, August 23rd on BBC One and BBC America.