Legend Sentai series Joint Gattai series is a toyline that was released to feature co-combining sentai robos in one scale. The mecha are simplified for the purpose of combining into well-proportioned robos, as well as working with other mecha from other series. The line offers no hinges and uses a system similar to Mugenbine and Micro Zords systems. The line is notable for allowing for an infinite number of combinations, something the DX Mecha line cannot provide for.