The Slow Mo Guys is a science and technology entertainment web series from Thame, England, created and owned by Gavin Free, starring himself and Daniel Gruchy.

[2][3] The series consists of a wide variety of things filmed in extreme slow motion using a range of Vision Research Phantom high-speed cameras, capable of shooting over 1,500,000 frames per second.

[5] The Slow Mo Guys is heavily influenced by Mythbusters;[6] in a typical episode, Free and Gruchy attempt to film some sort of natural or physical phenomenon in extreme slow motion: subjects of the filming are often some type of spectacular chemical or physical reaction, stress tests of certain objects under extreme conditions, while some episodes simply aim for an aesthetically pleasing result, often by the use of rainbow-coloured paints.

[8] The episodes generally feature Free as the cinematographer and camera operator, and Gruchy, a former ammunition technician corporal[9] in the British Army who served in Afghanistan,[10] as the rigger and often also as the stuntman.

[34] A large image of Free and Gruchy was printed on a London bus as part of the campaign,[35] alongside TV commercials, billboards and Tube station posters.

This has included filming of a sabrage competition with Rhett & Link;[39] dropping bowling balls with the Blue Man Group;[8] and providing Will Smith (wearing Gruchy's lab coat) a flamethrower to use on cardboard cutouts of himself.

This was essentially The Slow Mo Guys, but on a grander scale, featuring new equipment; larger stunts, such as crashing through walls; and special guests, including Dylan Sprouse and Mayim Bialik.

[41] In 2019, Free and Gruchy launched their second YouTube Original, Planet Slow Mo, in which the duo would travel around the world and film special events and stunts.

[46] Dr. Anthony Fauci, then-head of the National Institute of Allergy and Infectious Diseases, appeared in an October 22, 2020 video in which he and Free advocated for "the importance of wearing masks and face coverings" to prevent the spread of COVID-19.

[48] On February 4, 2021, Free appeared on behalf of the Slow Mo Guys on a Gates Notes-sponsored episode of PBS Digital Studios' Be Smart to promote herd immunity and COVID-19 vaccines.