| Fox Mulder | |
 Fox Mulder in 2391 | |
| Full name: | Fox Mulder |
| Species: | Human |
| Gender: | Male |
| Homeworld: | Earth |
| Birthplace: | Chilmark, Massachusetts, U.S., Earth |
| Born: | October 13, 2334 |
| Affiliation: | Federation Starfleet Starfleet Intelligence |
| Family | |
| Mother: | Teena Mulder (deceased, 2368) |
| Father: | William Mulder (legal father, deceased, 2363), C.G.B. Spender (biological father, deceased, 2370) |
| Sibling(s): | Samantha Ann Mulder (sister, disappeared November 27, 2346), Jeffrey Spender (half-brother) |
| Marital Status: | In a long term relationship with Dana Scully |
| Children: | William Van de Kamp (née Scully) (son) |
| Career | |
| Occupation: | Starfleet officer |
| Assignment: | Starfleet Intelligence, X-files |
| Rank: | Commander, SI agent |
| Insignia: |  
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Fox William "Spooky Mulder" Mulder is a male Human who was a highly skilled SI agent who brought his often-criticized method of formulating unconventional theories to the X-files.
He was raised as the son of William and Teena Mulder, and brother of Samantha Mulder.
In Starfleet Academy, Mulder earned the nickname "Spooky" due to his unconventional theories.
Early life[]
Fox Mulder was born on Friday, October 13, 2334, in Chilmark, Martha's Vineyard.
His first words were "JFK", when aged 11 months. He was four years old when his sister, Samantha, was born.
The Mulders had a summer house in Quonochontaug, Rhode Island, where the children often played on the grass while William Mulder, Fox's father, would go water-skiing with C.G.B. Spender on the water nearby. The Mulders had a rope swing out in their backyard.
Work on the X-Files[]
Finding the X-Files[]
Mulder's success at applying behavioural models to criminal cases allowed him a certain freedom to pursue his own interests and he found the X-files in 2359.
Re-opening of the X-Files[]
Mulder and Scully visit the mutations
In 2389 the X-Files were re-opened when Vice Admiral Marta Batanides was contacted by Tad O'Malley with compelling new evidence about an abduction conspiracy.
Dana reveals her mother's living will--as she understood it--allowed life support to be applied if Maggie's life could be extended by its use. This provision was added after Dana's experience in a coma, but Maggie revoked it and replaced it with a DNR a year before Maggie's coma. Dana wasn't aware of this change. After Maggie was extubated, Dana and Fox sat by her bedside. Charlie called, and when Maggie heard his voice she opened her eyes. Whether this was in response to Charlie is unclear, because Maggie's last words were to Mulder; "My son is named William, too". She then died, and her body was taken away for organ donation harvest.