Take a look at the IMDb staff picks for the best movies and series coming in September.

Staff Picks: What to Watch in September

"[link=/title/tt5875444]Slow Horses[/link]" and "[link=/title/tt22091076]High Potential[/link]" return with new seasons this month. Check out our [link=/list/ls4103534970/]September calendar[/link] for more!

September 2025 TV and Streaming Premiere Dates

&quot;<a class="ipc-md-link" href="/title/tt5875444?ref_=ttch_eds_right-5_lk">Slow Horses</a>&quot; and &quot;<a class="ipc-md-link" href="/title/tt22091076?ref_=ttch_eds_right-5_lk">High Potential</a>&quot; return with new seasons this month. Check out our <a class="ipc-md-link" href="/list/ls4103534970/?ref_=ttch_eds_right-5_lk">September calendar</a> for more!

Jóhannes Haukur Jóhannesson and Amir Wilson in The Letter for the King (2020)

Ruby Ashbourne Serkis and Amir Wilson in At the End of the World (2020)

Amir Wilson in The Letter for the King (2020)

Tiuri, a teenage squire, answers a call for help that sends him on a perilous mission across the three kingdoms to deliver a secret letter to the King.

Thaddea Graham and Amir Wilson in The Letter for the King (2020)

Amir Wilson: Tiuri

The Letter for the King

Amir Wilson credited as playing...

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