However, the peace is short-lived as the planet-conquering Troobian Empire and its leader Emperor Gruumm turns its destructive attention to Earth.

When the Earth's first line of defense, the Space Patrol Delta A-Squad mysteriously vanishes without a trace, the protection of the planet falls to their replacements: B-Squad Rangers Schuyler "Sky" Tate, Bridge Carson and Sydney "Syd" Drew, under the guidance of their dog-like alien commander, Anubis "Doggie" Cruger.

When reformed thieves Jack Landors and Elizabeth "Z" Delgado join the team as the Red and Yellow S.P.D Rangers, tensions threaten to tear them apart.

They are later joined by the Omega Ranger, a future version of a kid they saved sent back to prevent B-Squad's destruction from having a negative effect on his time.

Things come to a head when A-Squad returns and reveals they had not disappeared but in fact defected upon believing that fighting against Gruumm's forces was a losing battle, resulting in both Cruger and B-Squad being captured, though they quickly escape.

As B-Squad subdue their rogue teammates and route the Troobian's invasion, Cruger battles Gruumm and rescues Isinia.

SPD Rangers Supporting characters Villains A-Squad Guest Stars Three experienced B-Squad cadets, Sky, Bridge, and Syd, are assigned to bring in a pair of criminals who, just like them, possess genetic powers.

He becomes a target for Mora, who promises to be his friend if he helps her creation Bugglesworth turn the city's population into dolls.

(Series One Processor/Hyper Intelligent Ecryptor), who succeeds where her fellow D-Squad members failed by defeating Krybots during a training exercise.

Valko reveals his plan to defeat the Rangers by attempting the impossible: gaining control of a massive robot named Goradon.

While discussing whether they should believe the news or not, Morgana puts her plan into action, taking time to torment Z who hurt her doll in "Sam: Part 1".

The B-Squad's day off is brought to a halt when criminals they've already contained attack New Tech City, leaving them perplexed as to how they could've escaped.

When the Rangers constant bickering causes the criminals to get away, Commander Cruger sends the B-Squad to Planet Zentor where they are trained under the watchful eye of Sergeant Silverback.

With help from his associate Professor Cerebros, Broodwing uses the Red, Blue, and Yellow Dino Gems to transport Conner, Ethan, and Kira to 2025 as part of his plan to defeat the Rangers and destroy the planet.

The three confused Dino Rangers escape with their Gems and are soon cornered by Krybots, only to be saved by the B-Squad and taken back to the Delta Base.

Although Doggie insists they remain at the base to avoid disrupting the timeline, the Dino Thunder Rangers decide to do what they feel is right, teaming up with the B-Squad to drive back a robotic army and the Dragoul creature.

Meanwhile, Gruumm forces Zeltrax to join his army and ultimately faces the combined might of twelve Rangers who are determined to save the past, present, and future.

The B-Squad regulars deal with them and help Cruger defeat and overcome both Grumm and Omni, before being promoted to A-Squad status.

Studios's "Shattered Grid", a crossover event between teams from all eras commemorating the 25th anniversary of the original television series.