Legacy of Power

Legacy of Power is the fourth episode of Power Rangers: Dino Thunder, and the 500th episode of Power Rangers in general. It is most famous for showing clips of every Power Rangers season except Mighty Morphin Alien Rangers (which, to some, may not even be technically a season, since it was only ten episodes).

Plot
The Dino Thunder Rangers are in Dr. O's laboratory basement, panicking over his sudden disappearance. Ethan hacks into Dr. O's computer and sees his video diary, which explains his history as a Power Ranger.

Shortly into the video, Ethan pauses it so that he and Conner can let it soak in, that their teacher is the oldest living power ranger. Immediately, Haley (from the Cyberspace Cafe) shows up and corrects them, that Dr. O is not the oldest; just the best.

After a commercial break, she admits that she designed the Dino Morphers, explaining that Tommy was good with fossils and bones, but is not a rocket scientist.

The Rangers and Haley continue to watch more of Tommy's video diary while trying to think of some way to rescue him. After watching the history of Ninja Storm, Conner tries to show off some moves, and accidentally kicks the computer. Fortunately, that turned out to be a blessing in disguise, since it jogged the computer's memory and allowed Haley to locate an Invisiportal to Mesogog's lab, leading to the next episode, Back in Black.

Errors

 * In the beginning of the diary, Tommy claims that Kimberly, Trini, Billy, Zach, and Jason were the Earth's first Power Rangers. In fact, the Earth's first team of Power Rangers was in 1880, due to the events of Wild West Rangers.
 * Tommy claims that his friends were able to destroy the Power Sword to free him from Rita's spell, when in fact, the sword that kept him under her power was the Sword of Darkness.