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The time detectives had to go back in the year 2000, where they have to find the group of Time Shifters named The Cardians. But upon reaching the timeline, Sara and Tony surprised that the time they've gone to is the time when their uncle Dr. Goodman is a teenager and likes to smoke a lot and that explains why he doesn't have a girlfriend up to now. While witnessing the heroic deeds of the Cardians, Flint also must deal with Petra Fina when she takes control of the Cardians. After being freed by Flint, the Cardians form Cardian-Master to fight with the cat form of Petra Fina's Catamaran.
Nana Mizuki
Sora Yamato
Kiyu Morita
Tokio Yamato
Fumihiko Tachiki
Ototan
Chinami Nishimura
Puu-chan
Kappei Yamaguchi
Kyoichiro Narugami
Katsumi Suzuki
Toki-G
Toshiyuki Morikawa
Masked Man
Yumi Touma
Akira Aino
Chafurin
Mait
Hirohiko Kakegawa
Thomas Edison
Hiromi Ishikawa
Auguste Rodin
Hisao Egawa
Benkei
Keiichi Nanba
Hans Christian Andersen
Koji Ishii
Oda Nobunaga
Mitsuaki Madono
Beethoven
Motoko Kumai
Marco Polo