Additionally, multiple Doctors have returned in new adventures together in audio dramas based on the series. Peter Davison, Colin Baker and Sylvester McCoy appeared together in the 1999 audio adventure The Sirens of Time. To celebrate the 40th anniversary in 2003, an audio drama titled Zagreus featuring Paul McGann, Colin Baker, Sylvester McCoy and Peter Davison was released with additional archive recordings of Jon Pertwee. Again in 2003, Colin Baker and Sylvester McCoy appeared together in the audio adventure Project: Lazarus. In 2010, Peter Davison, Colin Baker, Sylvester McCoy and Paul McGann came together again to star in the audio drama The Four Doctors.