The Doctor and Peri take a holiday on the planet Gralista Social, but soon discover they aren't the only time-travelling aliens in town.

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_=tt_eds_right-5_lk">Slow Horses</a>&quot; and &quot;<a class="ipc-md-link" href="/title/tt22091076?ref_=tt_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_=tt_eds_right-5_lk">September calendar</a> for more!

Check out our gallery of the 33 first-time performer nominees this year, as the characters they so brilliantly played and in real life.

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