Trying to find an old cartoon movie

[Ravioli]

Im trying to find an old cartoon movie that i saw as a kid. Its in the Moomin Troll franchise, but i dont know the name of this particluar movie. If you didnt grow up in scandinavia/germany/japan, you probably never heard of it
http://en.wikipedia.org/wiki/Moomin

Anyway, the one im looking for had a horror theme too it. It scared the LIVING SHIT out of me as a kid. I started crying and hid behind the couch. I still think i have mental scars from watching it. I managed to find a trailer for it, but its in japanese or polish or something.

http://www.youtube.com/watch?v=pZcjyTjPyR0
(I tried looking for "buka muminki" ofcourse, but couldnt find anything. I need the english name)

If anyone knows the name of the movie and where i can find it, i would be greatful!

 

[Uriel]

http://www.youtube.com/watch?v=zeyU7uVOTic

 

[Minister]

All I know is that black ghost thing was called the Groke or something like that. Moomins freaked me out, even the little girl was scary.

 

[Eejit]

If you didnt grow up in scandinavia/germany/japan, you probably never heard of it

You're wrong.

And minister is right, it's called the Groke.