The Misadventures of the Dunderheads, also known as Montana Amazon, is a 2012 American independent black comedy road feature film starring Olympia Dukakis, Haley Joel Osment, and Alison Brie.

The Dunderheads are an eccentric Montana family who've been in the mountains far too long.

Now one step ahead of the law, matriarch Grandma Ira careens across the American West with her two wildly dysfunctional teenage grandkids.

[1] The film was shown theatrically in art houses across the South by The Southern Circuit in March and April 2013.

[4] In 2023, the film was recut to 83 minutes and retitled Montana Amazon Redux.