[3] The film features interview segments with Paul Stamets and Michael Pollan, and is narrated by Brie Larson.

The site's critical consensus reads, "As visually dazzling as it is thought-provoking, Fantastic Fungi sets out to make audiences see mushrooms differently -- and brilliantly succeeds.

[6][7] Josh Kupecki of The Austin Chronicle said "visual affectations aside, Fantastic Fungi is an engaging look at the scope of an organism that is so much more than a pizza topping or an ingredient in beef stroganoff".

[8] Andrew Pulver of The Guardian wrote "With its spectacular footage of growth and decay and impassioned speeches about the magic of mushrooms, this documentary is a treat for the eye and ear".

[6] According to Robert Abele of the Los Angeles Times "it edges a little too close to being a commercial, but that's a nitpick when the totality of Fantastic Fungi is so entertaining, informative and appealingly hopeful about the hard-working cure-all for our ailing world lying beneath our feet".