In comparison to Thunderbirds and other earlier series, Captain Scarlet is generally considered "darker"[14] in tone and less suited to child audiences due to stronger on-screen violence and themes of extraterrestrial aggression and interplanetary war.[15] The transition in the puppets' design has polarised critical opinion and drawn a mixed response from former production staff,[16][17][18] while the concept of an indestructible protagonist has also been called into question.[19][20] However, the series has been praised for its inclusion of a multinational, multiethnic puppet cast and its depiction of a utopian future Earth.[21][22][23] Having decided to revive the series in the late 1990s,[24] Gerry Anderson supervised the production of a computer-animated reboot, Gerry Anderson's New Captain Scarlet, which was broadcast in the UK in 2005.