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I wouldn't necessarily call these a failure, but Bandai, when they had the power rangers license they kept making lines and killing them every few years.
Super Legends- went from a 7'' line, to an 8'' roided out line, to a series of 6'' nicely done figures they eventually just stopped
Retrofire megazords- highly stylized Megazords in a 5'' scale
various 12'' lines
Some got great reception, some were DoA, but regardless they just got shut down after like 2 years