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?

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He even partnered up with the World Wildlife Federation.。

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

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