Beast Machines was an animated television series produced by Mainframe Entertainment that was a direct sequel to Beast Wars and is the final television series to take place in the original Generation 1 continuity. The show ran for two seasons, airing on Fox and YTV from 1999 to 2000. Of the Transformers animated series produced in North America, Beast Machines was the only one to have been completely conceptualized and outlined in advance, lending it a more serialized and linear storyline than the others although the quality of the storylines themselves have been heavily debated amongst fans. The Beast Machines intro theme was "Phat Planet", by Leftfield.
It started to air in Japan in 2004 under the title of Beast Wars Returns on a special Takara subscription service, with fairly good response. Toys were only available at Toys R Us stores in Japan & the UK. (Wikipedia)