Not only is this all episodes of the series, but there is a lot of small changes I've made to improve the watching experience of the series!

Here is the list of changes I've made:

All episodes now in 60FPS and 1080P
Some minor animation tweaks for an overall better viewing experience
Added Heatwave effect in AIZ act 2 because it makes sense
Launch base act 2 now has correct background palette
Big arm fight now has clouds in BG
Improved speed lines(?) as sonic falls from the sky after big arm fight
Sky changes colour after big arm so mushroom hill's sky colour makes more sense
Removed text 'season 2 coming soon!' as it isn't needed anymore and wouldn't make sense
Sandopolis heat wave effect looks much better and is more subtle
Fixed audio issue in LRZ act 1
Made the master emerald altar the same colour throughout the series (the purple looks cooler than the green anyway IMO)
Corrected Mecha Sonic's HUD
Made Mecha Sonic's vision a little more pixelated because it makes sense ig
Made screenshake in sky sanctuary a little more harsh
DE Zone's music is a little different because the original remaster by bouncyglow i used was claimed
Added extra SFX in death egg zone transition between act 1 and 2
Added extra credits that i forgot originally (sorry)
Added the 'knuckles and robo collab' logo at the end

00:00 Intro
00:03 Angel Island Zone
04:11 Hydrocity Zone
08:36 Marble Garden Zone
12:06 Carnival Night Zone
16:03 Ice Cap Zone
20:10 Launch Base Zone
24:18 Mushroom Hill Zone
27:39 Flying Battery Zone
31:38 Sandopolis Zone
35:48 Lava Reef Zone
41:36 Sky Sanctuary Zone
44:36 Death Egg Zone
49:12 The Doomsday
50:20 Ending
50:54 Credits
51:24 Teaser