In addition to the main and side channels MrBeast listed under the "channels" section on his main channel, MrBeast has 6 other secret and inactive channels: Totally Not MrBeast, beast, Beast Network, MrBeast5997, MrBeast5998, and MeTalkOverGames. The first five channels were discovered by Timeworks, DUCK The Chuck, and Maj Craft in a collaborative video uploaded by Timeworks on July 26, 2020, in a video titled "MrBeast Has Secret YouTube Channels? (discovered!)", with the last channel being discovered solely by Timeworks in a video titled "MrBeast Has A SECRET Channel With Only 60 Subscribers? (REVEALED!)". Until then, the channels were obscure to many fans, with little subscribers and views on the channels.
beast (formerly WeTalkOverGames and MrBeast6001) is a gaming/tutorial/analyst channel created by MrBeast on January 4, 2013. Originally, the channel was created by MrBeast and 3 of his old high school friends where they would do gaming videos and give commentary over it (hence the old name, WeTalkOverGames). However, the channel's ownership was handed over to solely MrBeast after the 3 friends quit, explained in a video titled "New Ownership Of This Channel" uploaded on July 12, 2015.
Afterwards, the channel became the original secondary MrBeast channel. Several tutorial videos were uploaded, relating to Sony Vegas and Call of Duty: Black Ops 3. Then, a few analyst videos were uploaded on the topic of estimating the amount of money famous YouTubers at the time had. This came after the channel briefly changed its format to be about "money". The latest video uploaded on the channel was "Weirdest Channel On Youtube" on February 20, 2017. It is currently inactive.
Totally Not MrBeast
Totally Not MrBeast (formerly mmoNOlife and MrBeast5999) was a gaming channel created by MrBeast on May 28, 2012. MrBeast used to upload MMO and MMORPG gaming content on the channel (as stated in the channel "about"), but they have since been deleted, hence leaving the channel with 0 videos. In the featured section, titled "DO NOT CLICK THIS!", the MrBeast5998 channel is shown. The channel has currently 10K+ subscribers.
Beast Network is an empty channel created by MrBeast on December 24, 2015. Under the featured is a section titled "Gameplay Partners Only Soon" with an empty channel named "john" under it. There is also an "Apply Here!" link in the "about" section, though it redirects to spam. According to the Beast Network Twitter account (which you can find here), Beast Network was a YouTube network and had at least 30 partners before going defunct in 2016.
MrBeast5997 is a channel created by MrBeast on December 8, 2015. There is only one video on the channel titled "THIS IS YOUR LAST CHANCE! STOP NOW!" uploaded on December 10, 2015, where MrBeast begs viewers not to visit his main channel.
MrBeast5998 is another channel created by MrBeast on December 8, 2015. There is also only one video on the channel, titled "DO NOT CLICK ON MRBEAST5887! STOP!" uploaded on December 10, 2015 as well, where MrBeast begs viewers not to visit MrBeast5997.
MeTalkOverGames was a gaming channel created by MrBeast on December 24, 2012, and is presumably the precursor to WeTalkOverGames. There are 3 videos available on the channel, all of which are of footage of Jimmy playing Call of Duty: Black Ops 2 with his commentary over it. The final video was uploaded on December 31, 2012, before becoming inactive.
CurrentContent was a channel created as a collaboration between MrBeast and Ziovo on June 22, 2016. The channel was an online news commentary channel meant to cover the "latest updates and news in the YouTube community and online world", discussing topics such as YouTube purging subscribers from channels. There are 7 videos uploaded to the channel, with the final video uploaded on June 28, 2016, going inactive thereafter. The channel also had a Twitter account. Its final tweet on August 5, 2016 announced that CurrentContent would be on hiatus.