Vulcan (Gabriel Summers) is a fictional comic book character, a supervillain in the Marvel Comics Universe. He first appears in X-Men: Deadly Genesis #1, and was created by Ed Brubaker and Trevor Hairsine. He is the third Summers brother to be revealed, a younger brother of X-Men characters Cyclops and Havok.
Vulcan first appeared in X-Men: Deadly Genesis #1 written by Ed Brubaker, a story which ran from January to July 2006. Vulcan then appeared in the “The Rise and Fall of the Shi’ar Empire” storyline, also written by Brubaker, in Uncanny X-Men issues between #475 and 486 (September 2006 to July 2007).
After Brubaker's stories in Uncanny X-Men Christopher Yost picked up the baton with the X-Men: Emperor Vulcan mini-series, which ran from November 2007 to March 2008.
On July 18, 2008, Marvel.com posted a news article of a modified cover of Emperor Vulcan with the phrase "Who Will Rule?" written on it, accompanied by the text "Stay tuned to Marvel.com and get ready for the blockbuster answer at San Diego Comic-Con!" This was all to build-up to the War of Kings storyline, and Vulcan's side of the story is set-up in the Kingbreaker mini-series, written by Yost.
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Official Site: Marvel
Links: Vulcan's Wiki Entry Vulcan on Comicvine Marvel Profile