Peter Capaldi's not just a fan of science fiction. This guy loves real deal science, too. 。

Dr. Who 。's beloved twelfth doctor made an appearance at the London March for Science on Saturday, much to the delight of science, and Time Lord fans alike. 。

SEE ALSO:The new 'Doctor Who' trailer promises an outrageously epic series。

Devotees were especially glad to see Capaldi because he'll be leaving the show at the end of the year -- but, hey, making your mark at the March for Science definitely counts as "out with a bang," right?

Mashable Top StoriesStay connected with the hottest stories of the day and the latest entertainment news.Sign up for Mashable's Top Stories newsletter。By signing up you agree to our Terms of Use and Privacy Policy.。By signing up you agree to our Terms of Use and Privacy Policy.。

Thanks for signing up! 。

Tweet may have been deleted。

Tweet may have been deleted。

Tweet may have been deleted
。

He even partnered up with the World Wildlife Federation.。

Tweet may have been deleted 
。

---

Now, if we could only find out where he parked the TARDIS. 。

---

Featured Video For You。

---

Giant icebergs are a big tourist draw in Newfoundland, and a warning sign
 。