3(ish) kids and an old man prevent an alien invasion using morse code (3D animation)

Unfortunately I can’t remember much about it because I saw it so long ago, like back in the 2000’s when I was a kid. I’m pretty sure it was on VHS but again it was a long time ago. The movie is a weird 3D animation. All I can remember is that there was an alien invasion about to happen and no one believed the kids that figured it out except this old man, who I think was one of their grandfathers. The kids somehow got in a spaceship and I remember them specifically going to Saturn and flying around the surface where it was all sand dunes. When they came back the aliens were all invading and they managed to tell the old man that the aliens started dancing when they heard morse code, so he goes up into an old tower and uses a morse code thing to blast it to the aliens. All the little ships start dancing. That’s all I can remember, please help me find this movie!

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