The Dungeon Evolves is patch 1.1. Masayuki’s team hits 30. Team Green Fury farms save points. Hinata clears everything except Veldora. Adalmann gets new magic. Rimuru invents avatars because the players found an exploit.
Previous: Season 4 Episode 1 — New Days · Hub: That Time I Got Reincarnated as a Slime
Hook
The Dungeon Evolves is patch 1.1. Masayuki’s team hits 30. Team Green Fury farms save points. Hinata clears everything except Veldora. Adalmann gets new magic. Rimuru invents avatars because the players found an exploit.
This page is the sequential stop after Episode 1 — not a random recap dump. Scores below are for this 24 minutes only.
Quick Information
- Anime: That Time I Got Reincarnated as a Slime
- Season / Episode: Season 4, Episode 2 (overall #74)
- English title: The Dungeon Evolves
- Japanese episode title: 進化する迷宮
- Runtime: ~24 minutes
- Studio: 8bit
- Original air date: April 10, 2026
- Kagex score: 8.5 / 10
- Where to watch legally: Crunchyroll (region-dependent)
Should You Watch It?
Watch it if you care how the labyrinth becomes Season 4’s toy and later a battlefield. Game-design episode with a Saint speedrun. Skip only if you hate dungeon talk; you will miss why avatars exist. Light on politics, heavy on rules. Fun for anyone who liked Episode 71.
Beginner-friendly? No as a start point. Watch from Season 1 Episode 1. This installment assumes you already know Tempest’s core cast — Rimuru at minimum.
Bottom line: sequential viewers should not skip “The Dungeon Evolves.” Fight-only watchers may feel the talkier stretches; nation-building fans will not.
Spoiler Warning
Spoilers for Season 4 Episode 2 (“The Dungeon Evolves”) follow. Stop above for a clean first watch. This page does not spoil later episodes.
Story Recap
Floor 30 is the new famous
Team Lightspeed runs it again and clears 30. Masayuki’s fame ticks up. Rimuru, Masayuki, Ramiris, Gard, and Veldora like the numbers. Then Team Green Fury starts blasting through too. Ramiris and Veldora get paid, which is adorable HR. Western merchants visit. Private labs for Rimuru and Ramiris go into the dungeon. The hole is an industry. Industries attract both tourists and scouts. Green Fury will turn out to be the second thing.
Save-point cheese
Gard says Green Fury is stacking members and saving before bosses. That breaks the intended economy. Floors 60 and 70 bosses are sick. Crusaders training inside are having a bad time, so Hinata runs the whole dungeon herself, clears it, and still cannot beat Veldora. Rimuru refuses to reward her, which is petty and funny. The Saint as the world’s best QA tester is the alliance paying rent in sweat.
Adalmann, please work
Rimuru, Shion, and Shuna visit Adalmann, who lost to Crusaders because he cannot use holy magic anymore. They help him build new attacks and give him a throne room. Ramiris’s Elemental Colossus still cannot respawn. Milim returns with Ranga and Gobta after training and is horrified her captured dragons got beaten. The boys get rewarded. The dungeon is a living org chart with failing bosses and a sulking Demon Lord.
Invent the avatar
To stop Green Fury, Rimuru builds devices that make monster avatars from thoughts and dump consciousness into them. They have to learn the bodies first. That is the next episode’s team name sitting on a workbench. It is also Rimuru answering an exploit with a new exploit. Very him. Very gamer.
A product that fights back
The labyrinth is no longer a festival attraction. It is a live-service war against clever adventurers, a Saint who can almost touch a True Dragon, and a party that smells like Council scouts if you squint. Season 4 is evolving the toy before it uses the toy as diplomacy.
Story Analysis
This is the most “Rimuru as game designer” episode since the labyrinth was built. Comedy is not paying Hinata. Emotion is Milim finding her dragons farmed. Mystery is Green Fury’s staffing trick. Pacing is status meeting plus invention.
World-building is save-point abuse as a real economic attack, Crusaders as dungeon residents, and avatar tech as a new magic-science branch. Hinata failing only at Veldora is power-scaling that still respects the dragon. Adalmann’s holy-magic hole is leftover Church lore becoming a boss patch.
Character Analysis
Rimuru is lead engineer. Masayuki is both player and consultant. Ramiris and Veldora are paid staff. Gard is ops. Hinata is the unpayable speedrunner. Adalmann is a boss in need of a kit rework. Milim is the angry content creator. Gobta and Ranga are trained and back on the payroll. Shion and Shuna are the hospital visit. Team Green Fury is the unnamed problem with too many bodies. Crusaders are the struggling student-players.
World Building
Dungeons have economies that break if you save-scum bosses. Labs can be built inside floors. Crusaders use the labyrinth as a gym, per Hinata’s Season 3 promise. Some constructs cannot respawn, which is a unique-item problem. Naming and training still produce better floor bosses. Avatar transfer is now a Tempest technology, not a one-off gag. Western merchant traffic means the dungeon is already a diplomatic object.
Nothing here is later-arc homework. If a name or rule is only teased, it stays a tease.
Animation
Dungeon runs, a Hinata speed-clear montage, Adalmann’s new kit, avatar-device reveal. Spend on Hinata versus floors and the Veldora wall. Green Fury can be a blur of efficient adventurers. A gameplay episode. 8bit should have fun with UI-like dungeon logic even without actual UI.
Kagex animation score for this episode: 8.3 / 10 — peaks vs average cuts, not a sakuga clip ranking.
Music and Voice Acting
Score 8.2. 8bit’s TV mix leans on Elements Garden sting + silence. Japanese track is the reference for Rimuru’s dual register (cute slime vs office-brain). Dub timing varies by season; don’t wait on it to judge the episode.
Hidden Details
- Green Fury stacking members is the tell they are not a normal tourist party.
- Not paying Hinata is a joke that also says Veldora is not a prize counter.
- Avatar tech is how Rimuru will police his own game without sending Diablo.
Best Moments
- Hinata full-clearing the dungeon and bouncing off a dragon.
- Milim learning her dragons got farmed.
- Rimuru answering cheese with avatar hacks.
Pros & Cons
Pros: Specific to “The Dungeon Evolves” —
A sharp dungeon-patch episode with a Saint speedrun and the birth of the avatar team. Watch it if you like the labyrinth as a character.
Cons: Requires earlier episodes. Viewers who only want climax fights may call the political / logistics scenes slow even when they are load-bearing.
Final Verdict
Kagex overall: 8.5 / 10 —
A sharp dungeon-patch episode with a Saint speedrun and the birth of the avatar team. Watch it if you like the labyrinth as a character.
- Story: 8.5
- Characters: 8.5
- Animation: 8.3
- Music: 8.2
- Enjoyment: 8.6
Hinata speedrunning Veldora’s house is elite. The save-point exploit made me laugh because of course someone would try that. Avatar plan is the right kind of extra.
What to Expect Next
Maribel remembers Earth, the avatar squad goes live, and Muese does not survive his performance review.
Next: Season 4 Episode 3 — The Avatar Team is Formed. Watch legally on Crunchyroll.
FAQ
Do I need to watch Season 4 Episode 2?
Yes if you are watching the TV series in order. Skipping “The Dungeon Evolves” leaves a hole later episodes assume you have.
What is the Japanese title?
進化する迷宮 — Crunchyroll English title is “The Dungeon Evolves.”
When did it air?
April 10, 2026 in Japan. ~24 minutes. Studio 8bit.
Is this Season 4 filler?
No. Tensura’s “quiet” hours are usually nation, diplomacy, or setup — not recap filler.
Where does this sit in the overall count?
Overall TV episode 74 of the main series (S1–S3 are 72; Season 4 continues from 73).
Should I watch Slime Diaries first?
No. Diaries is optional comedy. This review is the main TV track.
Where are character guides?
Tensura characters — Rimuru, Veldora, Milim, and the Tempest officers.
Where are facts / spoilers for the franchise?
Fact and Spoilers on the hub. This episode page stays inside Episode 2.
Keep exploring
- Tensura anime hub
- Season 1 review
- Overall review
- Previous: Season 4 Episode 1 — New Days
- Next: Season 4 Episode 3 — The Avatar Team is Formed
- Characters
- Fact and Spoilers
Your turn
Was “The Dungeon Evolves” a continue episode or a skip-risk for you? Favorite beat? Who should get the next character page?
Sources: Crunchyroll episode titles; Wikipedia list of Tensura episodes; official Tensura anime site.
