Zac Efron will join Will Forte, Gina Rodriguez and Frank Welker (Picture: Rex/WB)

Rumour has it Zac Efron has signed up to voice Scooby Doos Fred in the upcoming animated film Scoob.

Amanda Seyfried has also jumper onboard the Mystery Machine to lend her voice to Daphne, reports Deadline.

The pair will join Will Forte as Shaggy, Gina Rodriguez as Velma, Tracy Morgan as Captain Caveman, and Frank Welker who will reprise the voice of Scooby-Doo, having voiced the character for the 1960 – 1970 animated series.

Mandatory Credit: Photo by Andrew H. Walker/REX/Shutterstock (9662977aj) Amanda Seyfried The Metropolitan Museum of Art's Costume Institute Benefit celebrating the opening of Heavenly Bodies: Fashion and the Catholic Imagination, Arrivals, New York, USA - 07 May 2018

Amanda Seyfied will reportedly voice Daphne (Picture: getty Images)

The film is being produced by Warner Bros and will mark its return to the mystery series after the 2004 live-action film Scooby-Doo 2: Monsters Unleashed.

The upcoming flick will reportedly see the gang team up with other characters in the Hanna-Barbera universe – which includes The Flinstones, Wacky Races and The Smurfs – to save the world from the evil Dick Dastardly.

Zac Efron has received praise for his recent portrayal of Ted Bundy (Picture: Backgrid)

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Zacs transformed into the charming yet unnerving serial killer Ted Bundy for his latest venture on the thriller Extremely Wicked, Shockingly Evil, and Vile.



He said about the biopic: Ted had this thing about him, this magic Ted Bundy façade – his charm, the way he worked with people, people in prison loved him, cops seemed to think he was an OK guy.

He pulled the wool over a lot of peoples eyes.

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To transform into the notorious murderer, the High School Musical star had to get into the mind of him – by going vegan and wearing false teeth.

Zac said: Guys in the 70s had that wiry, kinda thin look. Ted was always kind of, a little bit gaunt. He always looked pretty tired. I had a good set of fake teeth and they were pretty easy to talk with after a while.”

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