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I WATCHED ALL THE INTERACTIONS OF ODYSSEY, ANGEL BULLET, DARK STAR, PREATORIAN, STAR GUARDIAN, GALAXY SLAYER (ODYSSEY), COSMIC. SO ALL THIS SKINS ARE IN THE SAME UNIVERSE? I MEAN I THINK STAR GUARDIAN IS COMPLETELY IN ANOTHER PARALLEL UNIVERSE BUT INTERACTIONS ARE STILL THERE ( I STILL THINK STAR GUARDIAN ARE ANOTHER TIMELINE. I JUST WANT TO KNOW WHAT DO YOU THINK THIS GALAXY THEME IS ALL ABOUT?
PD: SORRY ABOUT MY ENGLISH [sg-zephyr]
Most skins are in alternate universes even if they have some special lines for each other. These lines are simply "what-if"-scenarios. I mean Trundle has a special interaction with traditional trundle, even though traditional trundle is obviously not part of the main universe.
Going through the skinlines that you mentioned:
Odyssey and Galaxy Slayer are the same universe, Zed is just a vastly different entity in that universe, so his skin gets a different name. This skin line also has a connection to the Dark-star line, but the 2 skin lines occupy different universes(the dark stars are simply trying to infiltrate other universes)
Bullet Angel(also called Steel Valkyries) is in the same universe as Dreadnova
Dark Star is related to the cosmic skin line, the universe of these 2 is actually called "event horizon"
Praetorian is related to the Pulsefire skinline, though both of them seem to be able to jump between realities, so they might not have originated in the same universe.
Star Guardian is actually a standalone skinline, it has no official connections to any other
Also some other information regarding some skinlines:
Battlecast is only related to the Resistance skinline, its not related to any other sci-fi-skinline
In a similar vein Project is only related to Program and nothing else
Mecha is only related to the kaiju line, though Crabgot is the only kaijuskin so far
Super Galaxy isn't related to any skinline
Eclipse, Coven, Death Blossom and Elderwood are all in the same skinline, this includes dryad soraka and emerald taric
