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In the 20th adventure « Les rivales du temps » (Space time rivals) at the 1st page here, we can notice that the Aredit translator has seen fit to change the name of the Professeur Lumiere in Lomiere ! (an anecdote in all the stories of Garth that i have read the first name of the professor is quoted as « Jules » in the episode number 2 « children of the dawn. »
The rivals are of course the 2 hero girls Dawn (Aube) and the princess Karen met in the episode above, and this story takes place in the prehistoric time where our heroes travel with a chronosphere invented by the Prof. Lumière. (published in « Aventures Fiction » #1/second serie).

This adventure called « Le grand saut » (Flight Into The Future) is the continuation of « Les rivales du temps » (Space time rivals) but this time, our heroes are propelled in the future in 19660. At this time the world has changed, war doesn’t exist anymore, people are idle and happy and the climate is mastered. The only problem is the general RATABAN who tries to quench this world. Fortunately, Garth is here.  (published in « Aventures Fiction » #2/second serie).