The Ad-stronaut is an astronaut who promotes products for sponsors. He currently resides in the Ad-space.
He possibly first appeared in "Major Tom Speaks to More Responsible Ground Control", although other videos seem to contradict this. He has a father named the Dad-Stronaut, who lives on earth, and appeared in "How Animal Sounds Were Decided". He also has a brother and a cousin named Russell who both live in Canada. He has another cousin named Kyle, an alcohol and beer enthusiast, who was mentioned in "the First Guy to Ever Hire an Assassin".
In "How is the Ocean a Real Thing", he loses a thumb, toe, and nearly another thumb. The sponsor section ends with him beginning a search for his thumb. An ear is also shown floating around, but it does not appear to be his. We know that Ad-stornaut is lost in Ad-space, but he has his shuttle with him.
The Ad-stronaut is a former Professional Sleeper who was teleported to a space station after being knocked out at a job fair. He has a brother on Earth who was entrusted with sending bedsheets up to space. When he discovered that his brother was hoarding the bedsheets, he fired a laser at him, which missed and hit the neighbors instead. His brother believed it to be a warning shot and sent the bedsheets to him. At some point, the Adstronaut also became acquainted with The Sun, though it is unknown when this happened.
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- He is a musician and has won a Grammy award for his album "Just me going La La La" as mentioned in the episode Time Traveler Discovers Minecraft - THE FUTURE IS DUMB.
- The first episode he appeared in Major Tom Speaks to More Responsible Ground Control.
- He has a YouTube channel where he reacts to random videos. This was revealed The First Guy To Ever Open A Hotel video.
- The Ad-stronaut doesn't get payed any money at all.
- The Ad-stronaut is missing one of his thumbs and one of his toes as seen in the hip hop honesty quota video