12x35 House of Cards

Trent arouses the suspicion of his teammates as he tries to keep his promise to his father Anton and keep the scientist's identity as Mesogog secret. When Elsa uses a card she confiscated (during which her secret as Principal Randall is exposed to the Rangers and whole school) from Ethan as the basis for a powerful new monster, which is the Ruby Dragon. Trent's secret is on the verge of being exposed. Although the Rangers defeat their opponent, their real troubles are just beginning as they discover that Anton Mercer is Mesogog.