Havok
Havok (Alexander "Alex" Summers) is a fictional character, a mutant superhero in the Marvel Comics Universe and member of the X-Men. He first appears in Uncanny X-Men No. 54 (March 1969), and was created by Arnold Drake, Don Heck, and Neal Adams. Havok generates powerful “plasma blasts”, an ability he has had difficulty controlling. He is the son of Corsair, the younger brother of the X-Men's Cyclops, and the older brother of Vulcan. He often resents Cyclops' authoritarian attitude and reputation as a model X-Man.
In contrast, Havok and his longtime love interest Polaris have had a love/hate relationship with the team, often finding themselves roped into it. Both were also members of the 1990s-era Pentagon-sponsored mutant team X-Factor. After X-Factor disbanded, Havok starred in Mutant X, a series in which he explored a strange alternate reality. He has since returned to the X-Men, later taking over his father's role as leader of the Starjammers to bring Vulcan's reign over the Shi'ar to an end.
The X-Men
The X-Men are a fictional team of superheroes that appears in American comic books published by Marvel Comics. The X-Men were created by writer-plotter Stan Lee and artist-plotter Jack Kirby, and were first published in 1963.
The X-Men are "mutants", a subspecies of humans who are born with superhuman abilities. They fight for peace and equality between normal humans and mutants in a world where antimutant bigotry is fierce and widespread.
[Source: Wikipedia]

Image credit: vancamelot

The 25 caches of the X-men series are spread over a fairly wide area. The website cachetur.no has a useful route optimization tool, and may be of help to finders of this series. The site is free to use (it is donation supported). This YouTube video shows how cachetur can used to plan an efficient route. There’s even a trip template for the X-men caches that shows an optimized route, which can be copied to plan your own X-men trip (be sure to import the corrected coordinates into your trip).
Cachetur.no is a Geocaching® official API partner.