Charles Darwin was a 19th century English naturalist and geologist who Trillian dressed up as at a fancy dress party in the film version of The Hitchhiker's Guide to the Galaxy. Most people did not get who she was meant to be, instead calling her Santa, even though she thought the beagle was a dead giveaway. Arthur Dent was the only one to guess her correct identity, thus giving them something immediately in common.
- Mentioned in Fit the Sixth of the radio series
- Mentioned in the film The Hitchhiker's Guide to the Galaxy