The Mindless Summer was a series of live-streaming events that took place in August and September of 2021.
On five consecutive Fridays, episode of Mystery Science Theater 3000 were streamed on the show's YouTube channel, hosted by the current/upcoming casts and crew. These events are similar to the Live Riff-Along of 2020 and the events held during the Let's Make More MST3K crowdfunding campaign.
|Livestream||Air date||Episode / Event||Featuring|
|I||August 6||Experiment #817 - The Horror of Party Beach||Matt McGinnis, Tim Ryder, Nate Begle, and Beth 'Beez' McKeever|
|II||August 13||Experiment #414 - Tormented||Matt McGinnis, Yvonne Freese, Rebecca Hanson, and Conor McGiffin|
|III||August 20||Experiment #1005 - Blood Waters of Dr. Z||Matt McGinnis, Nate Begle, Tim Ryder, Jonah Ray, and Joel Hodgson|
|IV||August 27||Experiment #204 - Catalina Caper||Matt McGinnis, Rebecca Hanson, Conor McGiffin, Felicia Day, and Baron Vaughn|
|V||September 3||Experiment #608 - Code Name: Diamond Head||Matt McGinnis, Emily Marsh, Tim Ryder, Baron Vaughn, and Hampton Yount|