Invasion of the Body Switcher

A monster with the ability to alter appearances changes Vexica into Anna, who sneaks in the SPD Base.

Trivia

 * Fourth episode to have a ranger's birthday celebrated. The previous one is Susie Gold's 17th birthday in the Power Rangers Turbo episode "Car Built for the Gold". The next one is the Power Rangers Galactic Force episode "Orion Rising" where Anna turned 21.