Long story short, this is an update of the original Bubbline guide. Keeping the original season structure because CN can choke. That being said, I’m gonna update this one last time when the series ends with the new and by that point hopefully final order.
Out of 48 episodes since “Broke His Crown”: 2 must watch, 14 recommended and 22 optional. The two must-watch episodes if you really just want those: “Ketchup” and “Marcy & Hunson”.
Beyond the Grotto (optional):
A guest-animated episode that is highly optional. Though versions of both Marcy and PB appear, it’s not really Bubbline, I’m only mentioning it because of the cute Marcelien song. Then again, you could always just listen to it separately.
I Am a Sword (optional):
I do realize that I haven’t prepared you for the Finn’s swords storyline with the original guide and this might be something I rectify when I go over the whole list again, but for now, you might wanna watch this episode so later ones make sense.
Elemental (recommended):
This is a sort of continuation of the “Evergreen” storyline and crucial to later episodes, especially the “Elements” miniseries.
Five Short Tables (optional):
Not Bubbline but in case you’re interested in Gumlee, it’s teased here. I should’ve included “Bad Little Boy” for the same reason, dammit.
The Music Hole (recommended):
Partly the reason why I included “I Am a Sword”. A small Bubbline scene and Marcy totally sings about PB.
Preboot and Reboot, Two Swords, Do No Harm (optional):
The (original) Season 7 finale and Season 8 premiere, this is mostly so you’ll understand the Fern storyline later. Up to you if you want to dig deep into it though.
High Strangeness (optional):
A Tree Trunks episode that has interesting revelations about PB’s plans for the future. No Marceline, sorry.
Jelly Beans Have Power (recommended):
Continuation of “Elemental” and a strong Bubblegum episode.
The Invitation (recommended) Whipple the Happy Dragon, Mysterious Island, Imaginary Resources, Hide and Seek, Min and Marty, Helpers, The Light Cloud (optional)
The “Islands” miniseries, the first episode is recommended because of a small Bubbline scene and the rest of the miniseries is just interesting on its own. Watch if you want to know more about the fate of humanity and Finn’s soul-searching.
Orb (optional):
The tie-in between the two miniseries, completely optional.
Skyhooks, Bespoken For, Winter Light, Cloudy, Slime Central, Happy Warrior, Hero Heart, Skyhooks II (recommended):
“Elements” miniseries, included not only because of the few but very cute Bubbline scenes but also because it’s important as a whole and serves as the basis for “Ketchup”.
Abstract (optional):
If you want to know how Jake deals with the aftermath of “Elements”.
Ketchup (must watch):
Okay, so technically Bubblegum is not even in this one, but hear me out. A large chunk of this episode is Marceline’s prequel to “Elements” and her not being to be able to deal with the thought of losing PB so it’s true shipping fuel. But the rest of the episode is super cute as well and a great one for Marcy (and BMO).
Whispers, Three Buckets, The Wild Hunt, Always BMO Closing (optional):
All of these are continuations of the Fern storyline as well as the introduction to Uncle Gumbald. If you just want to know the gist of it and don’t care about Fern then just watch the next one.
Bonnibel Bubblegum (recommended):
An exploration of Bonnibel’s past and a cameo from Marceline.
Seventeen (recommended):
Gumbald attacks, minor but amazing Bubbline moments.
Marcy & Hunson (must watch):
Again, Bonnie isn’t in it much, but some very heavy hints towards Bubbline and the reconciliation of Marceline and her dad.
The First Investigation (optional):
So I don’t know yet whether the whole Jake and his alien parent thing is going anywhere relevant to this but just in case, here it is. It’s most probably important to the last 8 episodes.
Let me know if I can do anything else, also if you went through the original list.
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