London: Action movie "Rambo 5", starring Sylvester Stallone, will be filmed in Bulgaria.

The producers decided on Bulgaria because it is much cheaper to film there than in Arizona itself, contactmusic.com reports.

Stallone decided to return to the Rambo saga after the success of his recent Rambo film that he starred in, wrote and directed. The East European country will double as the US state of Arizona. This might be the last instalment in the franchise.

The character Rambo was seen returning to visit his father in Arizona towards the end of the last Rambo movie.