Looked for this movie for a long time and finally found it with English dialogue. There are Greek subtitles hardcoded onto the video but I don't consider that a big deal considering how hard it was to find this online. Enjoy
PLOT: The story involves a group of three teenagers who travel into their favourite TV show, named "Dino Saurs". Upon entering the new world, the trio comes across the character of Forry, a flying dinosaur who can't fly. His knowledge of Dinosaur World proves useful, as he guides the three kids to Tar Town, where they join up with Rex and Tops, two dinosaur freedom fighters willing to ignite a revolution against the villain, Mr. Big, and his evil caveman pawns, "The Rockies."