Sonic Underground - 1999 Underground Masquerade - 1.7 was released on:
USA: 24 October 1999
Sonic Underground - 1999 Sonic Tonic 1-17 was released on: USA: 11 January 2000
Sonic Underground - 1999 When in Rome 1-20 was released on: USA: 1 February 2000
Sonic Underground - 1999 Who Do You Think You Are 1-10 was released on: USA: 14 November 1999
Sonic Underground - 1999 Mobodoon 1-5 was released on: USA: 10 October 1999
Sonic Underground - 1999 Six Is a Crowd - 1.26 was released on: USA: 15 March 2000
Sonic Underground - 1999 Bug 1-16 was released on: USA: 4 January 2000
Sonic Underground - 1999 The Jewel in the Crown 1-21 was released on: USA: 8 February 2000
Sonic Underground - 1999 Art of Destruction 1-38 was released on: USA: 29 May 2000
Sonic Underground - 1999 Six Is a Crowd 1-26 was released on: USA: 15 March 2000
Sonic Underground - 1999 Tangled Webs 1-8 was released on: USA: 31 October 1999
Sonic Underground - 1999 Friend or Foe 1-18 was released on: USA: 18 January 2000
Sonic Underground - 1999 The Price of Freedom 1-6 was released on: USA: 17 October 1999