( Complicated network diagram under the cut )X-Men: Apocalypse (marked with an A) is linked to many films through the following people (you'll see why I've said many)
1 - Simon Kinberg - who also was also a writer for X-Men: Last Stand and Fantastic Four (2015) (these links pull X-Men: Apocalypse it into the "bad Marvel films" section)
2 - Michael Fassbender who is also in Assassin's Creed (which brought Assassin's Creed in and pulled the Importance of Being Ernest out - not sure why, but since it moved that much I've highlighted Importance of Being Ernest in blue)
3 - Stan Lee, who links X-Men: Apocalypse to the Punisher, Ghost Rider, Blade Trinity, X-Men Origins: Wolverine, X-Men: Last Stand and Fantastic Four (2015). I was not kidding about the bad Marvel section, although it's noticeable these are all films that Marvel farmed out (except Blade Trinity).
4 - Josh McLaglen links it to Avatar (marked B) and The Scorpion King.
5 - Hutch Parker was also a producer on Fantastic Four (2015)
6 - Lauren Shuler Donner was also a producer on Origins: Wolverine and Last Stand
7 - Garrett Warren, a fight co-ordinator for this. He also worked on Avatar and Teenage Mutant Ninja Turtles (marked as C) (as stunt co-ord and fight co-ord respectively)
8 - Trevor Habberstad - Hot Tub Time Machine (stunt co-ordinator for both this and that)