10 Must-Watch Movies on Prime Video in September 2026, From Theatrical Hits to a Sheep Murder Mystery

10 Must-Watch Movies on Prime Video in September 2026, From Theatrical Hits to a Sheep Murder Mystery

Collider just dropped its September 2026 Prime Video list and it's a banger: new theatrical hits, prestige classics, and yes — one very good sheep-based murder mystery. If your Amazon Prime Video queue has been gathering dust, this is the month to fix that.

The Headliners

Prime's September slate leans into variety. Recent theatrical arrivals anchor the list, joined by MGM library gems since Amazon's MGM acquisition — think James Bond marathons (Daniel Craig, Pierce Brosnan eras), Rocky with Sylvester Stallone, and Legally Blonde with Reese Witherspoon for comfort rewatches.

The prestige picks are where millennials win: Tom Cruise thrillers, Denzel Washington dramas, and festival darlings that skipped your local theater. And then there's the wildcard Collider specifically called out — a sheep-farm murder mystery (the delightful Lambing-adjacent indie wave) that's basically Knives Out with wool. Rian Johnson would approve.

How Prime Stacks Up This Month

September streaming is a war zone: Netflix has Smile 2 and Unabomber, Tubi is loading free titles, HBO Max pushes The Paper-adjacent comedies. But Prime's edge is the MGM vault plus day-and-dateindies. Pair it with The Lord of the Rings: The Rings of Power and The Boys universe (Karl Urban, Antony Starr) for a full weekend.

• New hits: fresh theatrical arrivals all month
• Classics: Bond, Rocky, Legally Blonde via MGM
• Wildcard: sheep murder mystery — trust us
• Also streaming: Rings of Power, The Boys, Reacher with Alan Ritchson

So grab popcorn, update that Prime queue, and give the sheep detective movie a chance. September's weirdest good decision awaits.