SUBSCRIBE for More Theories! ► http://bit.ly/1qV8fd6 Assassin's Creed Connection ►► http://bit.ly/2E6UG8a The OG Cross Over Theory ►► http://bit.ly/2tzJrQJ It's been a while since I've done a connected universe theory, but man did I find a BIG ONE! Doom Eternal is coming out soon, and it got me looking into that universe. Little did I know how far that reach would be! We are talking Fortnite, Kingdom Hearts, and even SHREK! Today Loyal Theorists, I am going to take you on the wild ride that is the Doom Connected Universe! Strap in! Need Royalty Free Music for your Content? Try Epidemic Sound. Get A 30 Day Free Trial! ► http://share.epidemicsound.com/MatPat SUBSCRIBE for Every Theory! ► ► http://bit.ly/1qV8fd6 Hang out with us on GTLive! ► http://bit.ly/1LkSBnz #Doom #KingdomHearts #Fortnite #DoomEternal #Disney #Marvel #Shrek #TonyHawk #Thanos #FinalFantasy #ConnectedUniverse #SharedUniverse #GameTheory Mario Maker BIGGER than the UNIVERSE! ► https://bit.ly/2CFNilS The END of Princess Peach! ► https://bit.ly/2CJuYbm How BAD is Mario's Blue Shell? ►► https://bit.ly/2BfFlUK Mario Kart 8, Mario's SCARIEST Game? ► https://bit.ly/2wyeell Luigi - Secret MILLIONAIRE?? ► https://bit.ly/2CEkk15 Credits: Writers: Matthew Patrick Researcher: Zach Stewart Editors: Dan "Cybert" Seibert, Chance Cole, and Tyler Mascola Assistant Editor: AlyssaBeCrazy Sound Editor: Yosi Berman Sources: https://web.archive.org/web/20060104031037/http://www.doomrpg.com/n.x/Doom%20RPG/Home https://tonyhawkgames.fandom.com/wiki/Doom_Guy https://www.reddit.com/r/FFXV/comments/6pyipb/signage_in_insomnia/ https://thelifestream.net/canon-of-ffvii/is-ffvii-connected-to-ffx-and-x-2/#narrative_gaps_of_the_link