The Simpsons hint at episode that will finally give fans something they’ve been waiting 35 years for

A new episode The Simpsons has been teased as something fans have been 'waiting for since 1989'.

The hit animated show will be returning to TV screens on Saturday 28 September with a brand new series, due to air on FOX. The first episode in the new series, titled Bart's Birthday, has been teased on social media.

"It’s the episode fans have waited for since 1989," The Simpsons official X account wrote alongside a trailer.

Marge and Homer will be helping their eldest child to celebrate his birthday. Marking a huge shift in The Simpsons canon, as none of the characters ever really age.

A new series of The Simpsons is set to be released. (Disney)

"Bart celebrates the most shocking birthday party of his entire life — one that might just change everyone in Springfield forever," FOX teased in a press release.

Fans are now wondering what the big surprise could be and have been sharing their theories on social media ahead of the launch of the new series.

One person wrote on X: "A canon change would be neat," while another asked: "He’s turning 11 finally? FINALLY?’"

"You mean something changes the status quo in a permanent way not in a family guy death of Brian way?" somebody else said. Another fan simply stated: "it’s about time," to which The Simpsons account replied with: "The wait is almost over."

Writer and producer Michael Price also teased the episode, but kept any further details under wraps.

"You do NOT want to miss this. A truly epic episode that people will be talking about on Monday. Written by @jessicajconrad, EP’d by @mattselman and Co-Run by yours truly," he wrote on X.

The trailer for Bart's Birthday doesn't go into much detail about what's to come, but the character can be seen outside Moe's Tavern suspecting "something super weird is going on".

The Simpsons return in a highly anticipated series. (Entertainment Pictures / Alamy Stock Photo)

A second scene shows Homer telling Bart: "I’m gonna take that miracle new diet drug! I’ll be skinny, but still have a huge head!"

WWE legend John Cena will be making a special appearance in episode, marking his Simpsons debut. Details of his appearance haven't been shared.

Elsewhere, the new series of The Simpsons also promises 'two terrifying Halloween episodes'.

One episode, titled In Treehouse of Horror XXXV, sees ‘giant monsters created by political rage threaten to tear the town apart, a Victorian Mr. Burns is jump-scared on Thanksgiving by the ghosts of his abused workers, and Homer bonds with a pair of extra-terrestrial jeans in an unforgettable stop-motion adventure that can only be called… Denim’.

A bonus special, titled Treehouse of Horror Presents: Simpsons Wicked This Way Comes, sees a tattooed man at a mysterious circus sending Lisa into ‘three strange stories from the innocent 1950s, the chilling retro-present, and a brutalist future where prestige TV rules the world’.