Transformers director Michael Bay has confirmed that villain Megatron is returning for the robot sequel.

Bay had earlier denied the presence of the Decepticon leader in this summer's Transformers: Revenge Of The Fallen.

However, Hugo Weaving, who voiced the character in the 2007 blockbuster, told Australian newspaper The Advertiser that he has already recorded his dialogue for the movie.

"[Michael is] over in LA and we were working on the video split sort of thing and I had this strange conversation where he seemed to imply it was all a big secret," Weaving explained. "So there you go - I've given you the secret scoop."

Bay has since acknowledged the appearance of Megatron, telling his Shoot For The Edit website: "Okay cat is out of the bag. Megatron is back - but you will only get to see him from the long lost past.

"We go way back in time as this movie explains the mythology of the Primes. He is not a tank like everyone suggests, but an alien vehicle. But sadly he does not have has much screen time."

Transformers: Revenge Of The Fallen is released in cinemas on June 26.