recently i talked about cross-overs with other Sci-fi series & movies and using copyrighted material from doctor who, and i have learned that theres a condition on copyright “time of use” and this can fall on a few villans, monsters & aliens that we could re-use we can not re-tell the story per-se, though it may be an option to do as long as its worth it, say a re-telling of celestial toymaker (for example), there has to be something elce going on as i said we cant re-tell a story exactly, we dont want to be repetive, nor copy (not even follow big finish exactly) so we have to have something new to do with the charictors we re-use, but other-wise we can use things as long as bbc arent or havent yet