I watched many years ago when I was a kid this animated film, and I just can't find it. It may be an episode from an anime, but I don't think so, as I remember it being longer than that... Here is what I remember:
I recall it starts with the protagonists in their house, and a mysterious ad appears on TV about this nice holiday place. They decide to go, and it is this mysterious house/hotel in the beach. It is quite weird because there are mountains with snow nearby to ski too.
Then it is revealed to them that they were chosen (or something) to travel to the future to save humanity because robots have enslaved them. The person from the future is in some sort of vehicle because they aren't able to walk, as they got used to being transported in personal modules.
In the future, the world is dominated by this robot, with a Very large head (and I think it was blue), that looks like a mad scientist, and is able to fabricate other robots (so they don't need humans). At the end they destroy the robot, and save the enslaved humanity.
I hope someone knows which one it is!
EDIT: Given the time when I watched it, the film should be from the year 2000 +/- 5 years I think.