Science fiction movie from presumably the 80s?

Saw it on TV during late 80s or very early 90s. A teenage kid/young adult on contemporary earth possibly sneaks out from his parents house at night or is simply out walking, and gets picked up by some guy in a car, asking him to come along. The guy might have been wearing a trench-coat and a hat, but that might not be correctly remembered. The kid doesn’t know about spacetravel beforehand, it’s all new.
They go on some sort of adventure (I think in space, but I don’t remember any of it) and in the end the guy returns the kid to the same place he got picked up from, also at night-time. I remember bushes and some fog and maybe a meadow nearby, or a small hill.

Before he returns home he has some sort of “fight” or altercation in what I remember as an alternate dimension or something thereabout. The setting was “open space” with somewhat large floating pieces of rocks, and he/they might have gotten there by means of some sort of yellow transportation device with sliding doors (elevator-type), and where in a hurry to get out of there. Might have something to do with a decision more than an actual fight, can’t remember.

Any and all help is much appreciated!
I remember that yellow thing looking a bit like a phone booth, but that might not be correct at all.

2 thoughts on “Science fiction movie from presumably the 80s?

    1. Sorry for late reply!
      No, I don’t think it’s not that one… Close though, with the picked up in a car scenario and a hat!! Maybe I’m mixing two different movies up in my mind… @.@
      Thanks though!!

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