Lost Kingdom

Lost Kingdom is an episode of Thomas' Adventures of Thunderbirds Are Go ( 2015 TV Series).

Plot:
After a seaquake near the coast of Greece reveals the lost city of Atlantis, Francois Lemaire ignores International Rescue's warning about aftershocks and with his wife, Melanie, venture below the depths to explore the area. When their submarine becomes stuck, Virgil and Gordon, alongside Thomas, Paxton, Percy, and Sidney, are called to assist. Brains, Professor M, and MAX go with them so that they could see the Solar Kythera, an ancient device used to view the stars.

Trivia:

 * Tom Thomas guest stars in this episode.