Digimon:The Movie
I'm no good at summaries(if only there was one wikipedia)so I'll let you find out for yourselves...
If this is a repost just tell me and I'll delete it.
Enjoy!(",)
The group travels to Gennai's home, where he unravels some secrets about the Digital World. When the kid return to the castle to open the gate, they battle with Dokugumon and the castle is destroyed.