When does Nexo Knights return?

Nexo Knights is a 3D animated television series that aired on Cartoon Network and premiered in 2015. It was produced by the Lego Group to coincide with the Lego theme of the same name. Four seasons were produced for a total of 40 episodes. A fifth season was also intended to be released with 1 wave of sets releasing for it. The series was cancelled before it aired in 2018.