Once a Ranger

"Once a Ranger" is a special two-part team-up episode of Power Rangers: Operation Overdrive, commemorating the fifteenth season of the popular Power Rangers children's television series begun in 1993. It features the return of five former Rangers who will aid the current team of Operation Overdrive Rangers.

Plot
According to TV Guide the two-part story revolves around Thrax uniting various villains and rendering the Overdrive Rangers powerless, causing the Sentinel Knight to assemble a new team of Rangers. No other infomation beyond that description has been revealed apart from in the second part of the story, Mack is kidnapped by Thrax.

Returning Power Rangers
Five former Rangers will be returning for the episode:
 * Adam Park: The second Black Power Ranger of Mighty Morphin Power Rangers, Zeo Ranger IV - Green of Power Rangers: Zeo, and the first Green Turbo Ranger of Power Rangers: Turbo, portrayed by Johnny Yong Bosch. In "Once a Ranger," Adam appears to be using the powers of the Black Power Ranger. Additionaly, in the teaser trailer, Adam can be seening wearing the Overdrive Rangers' Defender Vest while batting Thrax.
 * Tori Hanson: The Blue Wind Ranger of Power Rangers: Ninja Storm, portrayed by Sally Martin.
 * Kira Ford: The Yellow Dino Ranger of Power Rangers: Dino Thunder, portrayed by Emma Lahana.
 * Bridge Carson: Originally the S.P.D. Green Ranger of Power Rangers: S.P.D., portrayed by Matt Austin. In the finale of S.P.D., Bridge was promoted from Green Ranger to Blue Ranger. In a single photo released to the public, Matt Austin is wearing a red S.P.D. T-shirt, suggesting that Bridge is now the Red Ranger. The Red SPD suit is seen in the teaser trailer, confirming that Bridge will be the SPD Red Ranger.
 * Xander Bly: The Green Mystic Ranger of Power Rangers: Mystic Force, portrayed by Richard Brancatisano.