Robert Rusler portrayed Warren Keffer in the second season of Babylon 5.
J. Michael Straczynski has said that the character of Keffer was introduced solely because the television network wanted a "hotshot Top Gun kind of pilot" character to attract more viewers, and he never intended for Keffer to survive.
Rusler went on to play another ace pilot in Wing Commander IV: The Price of Freedom, the following year.
Although credited as a main cast member throughout the entire season 2, Rusler appeared only in the following episodes:
- Points of Departure, (2 November 1994) - Lt. Warren Keffer
- A Distant Star, (23 November 1994) - Lt. Warren Keffer
- GROPOS, (8 February 1995) - Lt. Warren Keffer
- There All the Honor Lies, (26 April 1995) - Lt. Warren Keffer
- Confessions and Lamentations, (24 May 1995) - Lt. Warren Keffer
- The Fall of Night, (15 August 1995) - Lt. Warren Keffer