Priyanka Chopra plays a double role for the first time in the futuristic "Love Story 2050" and the two characters are starkly different.

Rowena, producer-director Harry Baweja's daughter, who's assisting her father on "Love Story 2050", is effusive in her praise for Priyanka. The actress came to Baweja's rescue when Kareena Kapoor walked out of the film.

"Priyanka was elated and she jumped at the offer. It was a challenging role for her since her character goes through a spectrum of changes. The audience will get to see two very different sides of her personality in the film. She has pulled off both the characters with élan," said Rowena.

Priyanka's get-ups are diametrically different in the film.

"One part has her playing a mellow, coy, next door kind of girl while the other one is very outlandish, loud and headstrong. She's brilliant in both of them and I am sure her fans will love it."

Shot in Adelaide, South Australia, the film, which is loosely based on H.G. Wells' "Time Machine", is a futuristic science fiction loaded with special effects.

"It's a sci-fi love story that travels through time. As the title implies, the film is set in 'present' and 'future'. It is a romantic love story blended with science fiction and this unique combination of both the genres is the USP of the film.

"It's the first of its kind probably," said Rowena, adding, "A lot of computer graphics will be used to create Mumbai 2050. Oscar winner John Cox has worked on the animatronic robot Boo that we have used in the film."

Rowena elucidated the need for the robot in the film.

"Boo is Priyanka's companion in the film. He is her pet who talks to her, who does everything a human being can and who is someone every girl dreams of having."

Her brother Harman makes his debut with the sci-fi movie.

"Harman too has an interesting character to play. We have carefully outlined his role and hopefully the audience will connect with his character in the first 10 minutes itself," she said.

Rowena says it's her most exciting experience to date. Seventy percent of the shooting is complete and they are tentatively planning to release it in August.

"Very few have dealt with romantic sci-fi films. There's so much to explore when you're making a futuristic film. We are slogging really hard and I sincerely hope people enjoy watching it as much as we did making it. I am sure people would be curious to know how Mumbai would look in 2050."

Rowena admits that the film got delayed for various reasons but refuses to divulge the details.

The background music has been scored by Salim-Suleiman along with Anu Malik, with lyrics by Javed Akhtar.