Attended Oklahoma State University

Is commonly confused as being the brother of actor Jason Marsden. Although the two are not related, they are actually good friends and their respective wives have been friends since they were six.

Also has two brothers, Jeff and Robbie.

Has worked 4 times with actress Rebecca Romijn: X-Men (2000), X2 (2003), The Alibi (2006), and X-Men: The Last Stand (2006).

Is the only actor from the X-Men films who not only stayed on in the third film, after the departure of director Bryan Singer, but also worked with Singer on his subsequent project, Superman Returns (2006).

Daughter, Mary James Marsden, born on 10 August 2005.

An accomplished singer.

He wore lifts for most of his scenes in the X-Men movies, because his character Cyclops is supposed to be 6` 3" compared to a 5` 3" Wolverine. In actuality, Marsden is under 6 feet tall, slightly shorter than Famke Janssen (as his love interest, (Jean Grey) and approximately 4 inches inches shorter than Hugh Jackman (who played Wolverine).

His father is a Distinguished Professor of Animal Sciences & Industry at Kansas State University.

Joined the Delta Tau Delta fraternity while at Oklahoma State.

Graduated from Putnam City North High School (located in Oklahoma City) class of 1991.

Turned down the lead role in 54 (1998). Ryan Phillippe later got the role.

Lost out to Edward Norton for a role in Primal Fear (1996).

In 1991, while vacationing with his family in Hawaii, he met actor Kirk Cameron and his actress sister Candace Cameron Bure; the Camerons invited Marsden to visit in L.A. and thus began his career.

Son Jack was born on February 1, 2001, in Los Angeles weighing 7 lbs., 14 oz.

Attended Oklahoma State University.

He has two sisters: Jennifer - age 24 and Elizabeth - age 12, as at 2004. Jennifer lives in Studio City, California and Elizabeth in Manhattan, Kansas.