La Brea Tar Pits à Los Angeles, célèbre dans le monde entier, renferme un lourd secret, celui d'une créature qui, réveillée par des travaux souterrains, va bouleverser la vie de Barry Greenwood et de ses collègues en les plongeant dans une lutte désespérée pour leur survie.
Yusuke Godai awakens from a nap at the Pore Pore Tea Cafe and finds a scrapbook with newspaper clippings about his battles as Kuuga. As he reminisces about each fight, gaining each of his forms and the Gouram attachment for the TryChaser, Godai gets a call about a new Gurongi. Godai heads over and transforms into Kuuga to face off against the beast who introduces himself as Go-Jiino-Da!