Grand Unifying Guesses/Heroes (TV series)

Heroes takes place in the same universe as the following.

 * Pushing Daisies
 * Wonderfalls
 * Supernatural
 * Reaper
 * Dead Like Me
 * X-Men. Heroes takes place before it becomes known that people are developing superpowers. When the world finds out, they are called mutants.
 * Journeyman
 * The 4400
 * Ranma ½
 * Watchmen 1st Corollary: worked with Adam and Linderman. 2nd Corollary: Watchmakers hold the ultimate power.
 * Star Trek Just off by 200 years.
 * Dark Angel
 * Painkiller Jane
 * Sanctuary
 * Witchblade
 * Dark City
 * The X-Files
 * Buffy the Vampire Slayer and Angel.
 * Torchwood and thus Doctor Who (and Claude IS the Doctor)
 * Fringe
 * Cloverfield
 * Good Omens
 * Marvel's Civil War
 * The Matrix
 * Battlestar Galactica post-series
 * BioShock (series) (the catalyst is A.D.A.M.)
 * Death Note the Kiras are Evolved Humans and L's taskforce are Cape Busters.
 * Birds of Prey
 * Smallville
 * The Cthulhu Mythos
 * Power Rangers
 * Men in Black
 * Dragonball Z
 * CSI
 * Highlander
 * Charmed
 * The Simpsons
 * Harry Potter
 * The Dark Knight trilogy
 * Saw
 * The Incredibles
 * Lost
 * When the plane crashed, there was an accident, causing it to phase into an alternate version of reality, where it landed on the island. John Locke used its power to send them back to their own version of reality, and their island is where the plane ended up (sorry, can't recall the exact location).
 * Phineas and Ferb
 * Push
 * No Ordinary Family
 * The royal families of Dune are the descendents of the Petrellis (A Spotlight-Stealing Squad family of magnificent bastards and/or emos that have won the Superpower Lottery).
 * As is the Uchiha Clan.
 * ...and they all share Darth Vader or Darth Revan as a common ancestor.

The Company has a second Board of Directors.
Angela and Arthur Petrelli, Maury Parkman, Linderman, and the others were just a front. Even though their Company is now destroyed, a second Cabal works behind the scenes, pushing things to create opportunities for World Domination. The members of this Cabal are:
 * Tim Kring, because you know that would make sense.
 * Haruhi Suzumiya, because it's obligatory.
 * Doctor Doom, because his brilliant mind would not allow him to miss this opportunity.
 * Mr Muggles, because everyone else thinks so.
 * Sweeney Todd, because why not?
 * Fred the Manniquin, because he already betrayed Will Smith...
 * Adam Monroe, because it was mentioned in the show.
 * Zach from Season 1, because someone needed to spy on Claire...
 * Dr. Phil, because haven't you seen that photo of him pointing his finger at the camera, Sylar-style? Obvious proof that he eats brains!
 * Edward Cullen, because everyone needs an Ultimate Evil.
 * Molly Walker, because she's too cute to not be suspicious.
 * Albert Wesker, because Umbrella is staffed by imbeciles.