BIG BRAIN TIME | Oxygen Not Included - Part 5

  • Published: 27 September 2019
  • It's time I put my big brain to work and solve these problems once and for all! Except maybe actually the opposite...



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Comments • 2 065

  • SnowMan
    SnowMan  2 days back

    is he doing all of these sleep deprived?

    • Melkirdin Marais
      Melkirdin Marais  2 weeks back


      • Jason Mahoney
        Jason Mahoney  4 weeks back


        • Joey the Jew
          Joey the Jew  1 months back

          Did anyone see the characters in the thumbnail have big heads

          • Vampy_Rhombus5006
            Vampy_Rhombus5006  1 months back

            I hope things go according to plan

            • Volvith
              Volvith  1 months back

              Hey Mark, if you ever feel masochistic, go watch Brothgar play this game.
              ... You could have been an engineer, Brothgar might as well be at this point. (i'm talking spreadsheet machines that... It's insane. Just fucking insane.)

              • Cory Buck
                Cory Buck  1 months back

                Why no lice loaf?

                • Cory Buck
                  Cory Buck  1 months back

                  Its so you can relive your mistakes Mark

                  • Sadie Abernathy
                    Sadie Abernathy  1 months back

                    oh god his science is so wrong

                    • Box Seal
                      Box Seal  1 months back

                      This episode he turned into markiplier requiem and then gained the biggest of brains

                      • ninjariaden96
                        ninjariaden96  2 months back

                        Mark at 2:00: O H I T S B I G B R A I N T I M E

                        • Matthew Tandy
                          Matthew Tandy  2 months back

                          You can see sometimes when mark like gets out of his own way and the part of him that studied to be an engineer really shines through

                          • Bowser Jr Racing
                            Bowser Jr Racing  2 months back

                            15:18 HEE HOOOOO

                            • S.O.L
                              S.O.L  2 months back

                              *High pitched* hEe-hOo

                              • Patrick Zysk
                                Patrick Zysk  2 months back

                                12:52 I think the device you're looking for is called an enema

                                • O Na
                                  O Na  2 months back

                                  Its okay for contaminated water to use for research or something else, but not on your food pleaseee

                                  • Frankie Matthews
                                    Frankie Matthews  2 months back

                                    Playback speed x2 Mark is on crack!!!

                                    • kazz
                                      kazz  2 months back

                                      OH MY GOD THERE WAS A GUY FOR COOKING MARK U aaaaaaaaaaaaaaaaaaa

                                      • ZelosWilder
                                        ZelosWilder  2 months back

                                        I know I'm way behind, episode wise... But This is WHY TOILET SYSTEMS ARE GOOD.... Albeit expensive. Toilet funnels polluted water into reservoir. System purifies water. Pumps pure water into toilets... Food poisoning makes vomit, making additional polluted water for reservoir.

                                        Before OTHER problems went wrong... I had 3 or 4 backup tanks packed with water.

                                        • Grace Caroline
                                          Grace Caroline  2 months back

                                          mark: *is running out of water and making too much oxygen*
                                          also mark: *doesnt remove the things that are taking all the water and making too much oxygen*

                                          • Tank Burnham
                                            Tank Burnham  2 months back

                                            "Guys, I'm not crazy.... Right?!" -Mark 2019

                                            • Fox Landschoot
                                              Fox Landschoot  2 months back

                                              If he just made the showers and toilets he could run it right in to the water refinery and itd clean it which means more water

                                              • Anim dude
                                                Anim dude  2 months back

                                                "BIG NUT TIME"

                                                • Sir Vinny
                                                  Sir Vinny  2 months back

                                                  Mark. Will you play rimworld

                                                  • tobe wolf
                                                    tobe wolf  2 months back

                                                    I see that you made a slight change to the thumbnail. Details!

                                                    • Zylb Slk
                                                      Zylb Slk  2 months back

                                                      Finally using that engineering degree for a tiny piece of smarts

                                                      • WolkeStreit
                                                        WolkeStreit  2 months back

                                                        "I dreamed a dream that I was an asshole."

                                                        Are you sure that was a dream Mark?

                                                        • ExplodingJellyfish
                                                          ExplodingJellyfish  2 months back

                                                          Markiplier: Yeekachu, you're the one you gotta catch em all if you know what I mean, come get your snazzy outfit
                                                          Me, Looking at the recommended "Part 6" of this series, seeing the title "IS YEEKACHU DEAD?!": Uh oh.

                                                          • DOT iXi
                                                            DOT iXi  2 months back

                                                            *cough* *cough* hydrocarbon combustion? *cough* *cough*

                                                            • Francesco Pimazzoni
                                                              Francesco Pimazzoni  2 months back

                                                              Mealwoods don't need light to grow, so for the power shortage u can simply turn off the lights

                                                              • Pokemonfeak1
                                                                Pokemonfeak1  2 months back


                                                                Mark: I need to get water into my...Ass

                                                                Me: you mean an enema?

                                                                • nottuS neB
                                                                  nottuS neB  2 months back

                                                                  Mark: Can we fix it?
                                                                  also Mark: No!

                                                                  • Cole Lea
                                                                    Cole Lea  2 months back

                                                                    As someone named cole, this episode felt so weird. "Santa wouldn't give me coal if I wasn't on the right path". "I love coal, I love a coal,"

                                                                    • TheTrueGamer
                                                                      TheTrueGamer  2 months back

                                                                      I’m a virgin

                                                                      I’m also dead

                                                                      • nuke party 101
                                                                        nuke party 101  2 months back

                                                                        As mark rambles on I'm sitting here just noding with him

                                                                        Also does anyone else get worried whenever Mark says: I just had a thought. Or is it just me

                                                                        • Jay Jay
                                                                          Jay Jay  2 months back

                                                                          I can't get enough of this series. I like it so much, its the funniest thing ever.

                                                                          • Dark Wolf
                                                                            Dark Wolf  2 months back

                                                                            Using Big Brain moves Mark.

                                                                            • reaps love life
                                                                              reaps love life  2 months back

                                                                              When Mark has a good idea am i going insane???

                                                                              • Johnathan Carson
                                                                                Johnathan Carson  2 months back

                                                                                7:53 the sound of true horror.

                                                                                • Venom Quill
                                                                                  Venom Quill  2 months back

                                                                                  I felt like screaming when he put air tiles in the restroom and then found polluted air everywhere. :,) I still love you, Mark. Haha

                                                                                  Also, MArk gunna die. He's going to be cover in hot, clean water that's going to be given to the algae immediately. In the process, he'll probably get burned. If that doesn't happen, something else will!

                                                                                  • Ironengie
                                                                                    Ironengie  2 months back

                                                                                    How can you have to much oxygen

                                                                                    • Alexander Schmidt
                                                                                      Alexander Schmidt  2 months back

                                                                                      Anyone else wondering where the rest of oxygen not included is?

                                                                                      • popturt fart
                                                                                        popturt fart  2 months back

                                                                                        Me who’s played oxygen not included a lot after mark played it the first time: it won’t be that bad he knows what he’s doing
                                                                                        Mark: has bristle blossoms before hydro farm tiles
                                                                                        Me: *confused screaming*

                                                                                        • morten sørensen
                                                                                          morten sørensen  2 months back

                                                                                          lighting mealwood plants ..why?

                                                                                          • XxTony xX
                                                                                            XxTony xX  2 months back

                                                                                            "Where is some salt water? That's not enough... Where is some- Woah... Hehe, Targ-Target acquired" Markiplier 2019
                                                                                            "That's not gonna come bite me in the buuuttt" mark
                                                                                            Me:Mark... Saying that makes Karma mad...

                                                                                            • SmoL_RM BTSArmy
                                                                                              SmoL_RM BTSArmy  2 months back

                                                                                              Can we fix it?

                                                                                              Bob: Yes we-
                                                                                              Mark: No wE cAnT!¡!

                                                                                              • Warded Thorn
                                                                                                Warded Thorn  2 months back

                                                                                                hEeEe HoOoOo

                                                                                                • amanda white
                                                                                                  amanda white  2 months back

                                                                                                  "I dreamed a dream and I was an asshole"-Markiplier 2019

                                                                                                  lmfao why mark why xD