both were shown on channel 4 about 10 years ago
first film
It is about a military guy, who uses some maths formula to move the moon towards the earth, inorder to destroy the earth. This was one film, not a series. There can't be many anime with this plot.
second film
Another anime film, not a series. This is about a boy who is stuck in a metropolis, and dreams to travel to this higher city. But it has a tragic ending when he is trying to go along this wire to this higher city. It has a memorable scene when he is going along this wire, but he does not make it.
I also remember seeing this anime film advertised on a video trailer.
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