This is a tool-assisted speedrun. For more information, see tasvideos.org/2342M.html
X seeks to find the lost Maverick Hunter Zero, who has gone missing since X5. Of course, once found, Zero does most the dirty work, while X is practically nowhere to be found.
This run completes all stages, as opposed to the any% level run. You can see how nasty every level is on Xtreme difficulty. As always, Zero is much better suited to killing bosses than X. Zero also uses powerups which he wouldn't be able to use in an any% run.
Improvements from the previous movie comes from a new trick with X to skip totem poles in Ground Scaravich stage and a route change.
Check the details here: tasvideos.org/3792S.html