This is a 70s or 80s, at the most early 90s movie. I don't remember much of it. The main character (male) is an alien (looks human) or time traveler or some interdimensional traveler.
I don't know how he ends up on earth. There is this tiny ball-like robot with AI that helps him, or maybe it was a glowing light ball or something. A bunch of kids help this guy out & hide him in their garage or shed or something. Also this guy is trying to escape some people from where ever he is from. He has a radio which he uses to stop these people from crossing over from their dimension/timeline/whatever. The radio interferes with the portal/event horizon which is a fuzzy gateway and stops the people who are trying to get him.
Anyone have any idea what this movie is?