Head of state succession is the process by which nations transfer leadership of their highest office from one person to another. The succession of a head of state can be brought about through various means, the most common of which include:
Although Battlestar Galactica (2003) is not set on Earth, the political structures of the 12 Colonies of Kobol closely resemble those of the United States. During the Cylon attack, Secretary of Education Laura Roslin receives a message from the Case Orange automated beacon, a special mechanism seeking communication with any surviving Colonial government officials. After verifying her identity, she learns that—other than herself—all members of President Richard Adar's government have apparently been killed or are missing. The Case Orange response assigns Roslin new instructions, and she (the 43rd in the line of succession) is duly sworn in as president.[1][2]
King Ralph: The entire British Royal Family is killed in a freak accident, and controversially the next person in line to the throne is a working-class American (John Goodman).
References
^Jeffrey, Mark (2008-09-02). "Sarah Palin: Laura Roslin?". The Huffington Post. Retrieved 2009-01-25. The constitutional line of presidential succession ends up falling to the still-living Secretary of Education -- Laura Roslin -- who is then sworn in as President.
^Heffernan, Virginia (2006-10-26). "TELEVISION; In Galactica, It's Politics as Usual. Or Is It?". The New York Times. p. 1. Retrieved 2009-01-25. Initially the insurgents enjoyed the backing of the leader of the humans -- a onetime cabinet member named Laura Roslin (Mary McDonnell) who rose to the office of president when those ahead of her in the line of succession were wiped out -- but lately she has found their suicide tactics insupportable