u/18bluecat

Edit: Solved! Land of the Lost!

I saw it when I was a kid, all I remember was there were three people on the adventure. One of them wanted to be left behind in the world. When the two leads made it back to the surface, they found themselves at like a gas station or car wash and they embraced. The sole employee of the business asked about their boss (the one left behind) and assumes they killed him on their adventure.