 In the 1970s, CTV produced "The Starlost" in its Scarborough studios.In the 1980s, many animation houses, most notably Nelvana, began producing a growing proportion of the world market in animation; Canada has become the world leader in 3D animation with shows like "ReBoot" and "Tripping the Rift".Only in the 1990s, with changes in exchange rates and tax legislation, plus a growing skills set among local production companies which had had success in local production and in producing films for American and international markets, that Canada became an important player in live action speculative fiction on television, with shows like "Forever Knight", "", and most notably "The X-Files" and "Stargate SG-1".