To understand how a horrible mess of a movie like Journey to the Center of the Earth came to the existance one has to know about the history behind it. The filming had started already in 1986, but the movie was left unfinished midway and Cannon Films was left with a dud of a movie so they hired Albery Pyun to finish the film.
Pyun who later disowned the whole project and remains uncredited alledgely wrote a new screenplay with zero budget and made it sort of a sequel to the Alien from L.A. (1988) he had just finished shooting.
And all of this shows. Journey to the Center of the Earth (1988) in nobody’s passion project, lacks ownership and direction and ends up totally incomprehensible and definitely one of the biggest train wrecks of the era that should never seen the light of the day. The tragedy is that the actors aren’t half bad, and there’s a constant feeling of a half decent scifi adventure movie being buried under all the pile of garbage that ended up on the screen.