|This article is about a/an episode in Power Rangers S.P.D.|
Gruumm travels into the past and recruits Zeltrax in his plan to conquer Earth before the formation of S.P.D. The S.P.D. Rangers must follow him and teamup with the Dino Rangers in order to stop them before the wormhole closes and they're trapped in the past.
Emperor Gruumm is confronted by Omni to prepare for his arrival on Earth. Gruumm takes the Terror through a wormhole 21 years into the past. Kat alerts the Rangers of Gruumm's temporal trip into the wormhole. At Reefside High, in 2004 - Conner, Ethan, Kira, and Trent witness a spaceship hovering over the school. Gruumm has arrived in his ship, the Terror to take over the Earth without interference from S.P.D. Commander Cruger sends Jack, Bridge, and Z on a mission to follow Gruumm through the wormhole. The Dino Rangers go into the woods in search of the Terror. Rather than finding the Terror, they are confronted by Zeltrax and the Tyrannodrones. Jack, Bridge, and Z travel into the wormhole in search of Gruumm. As the Dino Rangers fight Zeltrax, the Terror appears and beam him aboard. Gruumm insists that Zeltrax defeats the Power Rangers, and Zeltrax assures him that it would be his pleasure. Jack, Z, and Bridge reintroduce themselves and inform the Dino Rangers of Gruumm's plans. Meanwhile as the wormhole closes, the other S.P.D. Rangers prepare to join up with the others before the others are trapped in the past. Meanwhile, Tommy appears as the Black Ranger in a battle against Zeltrax. The Dino Rangers teamup with the S.P.D. Rangers to fight Zeltrax, Troobians, and their footsoldiers. Zeltrax leads an army of three monsters that created by Mora, all three levels of Krybots, and the Tyrannodrones. Gruumm and Mora watch as the rest of the S.P.D. Rangers show up and his forces join together against all 12 Rangers. Tommy and Doggie meet for the first time and lead the Rangers against their oponents. Kira, Syd, and Z team up to display girl power while Sam and Trent work together using White Ranger power. Bridge, Ethan, and Sky display teamwork Green/Blue Ranger style as the Black Rangers, Tommy and Cruger, defeat Zeltrax just before he retreats. Jack and Conner both activate their Battlizers to take out Mora's creations. The Power Rangers assemble the Z-Rex Blaster and the Canine Cannon to finish off the footsoldiers. Before the S.P.D. Rangers return to the future, Doggie erases their and the Dino Rangers memories.
- Brandon Jay McLaren as Jack Landors (S.P.D. Red Ranger)
- Chris Violette as Sky Tate (S.P.D. Blue Ranger)
- Matt Austin as Bridge Carson (S.P.D. Green Ranger)
- Monica May as Z Delgado (S.P.D. Yellow Ranger)
- Alycia Purrott as Sydney Drew (S.P.D. Pink Ranger)
- Michelle Langstone as Kat Manx
- Olivia James-Baird as Mora
- John Tui as Doggie Cruger (Shadow Ranger)
- Brett Stewart as Omega Ranger (voice)
- Rene Naufahu as Emperor Gruumm (voice)
- Derek Judge as Blue-Head Krybots (voice)
- James Gaylyn as Orange-Head Krybots and Zeltrax (voice)
- James Napier as Conner McKnight (Red Dino Ranger)
- Emma Lahana as Kira Ford (Yellow Dino Ranger)
- Kevin Duhaney as Ethan James (Blue Dino Ranger)
- Jeffrey Parazzo as Trent Fernandez (White Dino Ranger) & Dr. Tommy Oliver (Black Dino Ranger) (voice only)
- While Bridge is correct in stating that Conner, Kira and Ethan's memories were erased in their previous encounter, they were taken from 2005, whereas the current encounter is in 2004.
- Although Doggie erases the memories of himself and the other Rangers, Tommy and Sam aren't present and remain with their memories intact. And then the Dino Thunder teenagers saw the SPD team anyway. Also, all the students of Reefside High still remember the Terror.
- Due to Mora's behavior during this in "Resurrection", it is likely that "Wormhole" takes place right before she gets brainwashed at the end of "Insomnia", and as such the second episode to take place within another. The first being "I'm Dreaming of a White Ranger".
- This episode was aired early in Canada. It is first officially released as an exclusive DVD episode on S.P.D. Volumes 4 & 5. It's first official TV appearance is inconveniently after the series has ended for at least two months.
- Tommy does not appear unmorphed in this episode, due to the fact that Jason David Frank wasn't present. Morphed as the Black Ranger, he was voiced by Jeffrey Parazzo who plays Trent the White Ranger. Jason David Frank stated at a Power Morphicon that he was not given an offer to appear in the episode, as Disney did not want to pay to fly him to New Zealand.
- The placement of this episode within the Dino Thunder timeline is sometime after "The Passion of Connor" due to the Triassic Battlizer being present, and before "House of Cards". Although, Zeltrax was never seen leading Tyrannodrones at this point in the season. The whereabouts of Mesogog is never addressed.
- Jack makes a reference to Tommy's legacy by stating that he's read all about him at the academy. He only calls him "Black Ranger" though.
- The first orange head Jack fights uses orange painted chronosabers, from Power Rangers Time Force.
- Trent's morphing call is different in this episode than it was during the "Dino Thunder". In "Dino Thunder" his morphing call was "White Ranger, Dino Power". However in this episode he uses the same call as, Conner, Ethan, and Kira, "Dino Thunder, Power Up".
- This is the final season to have a team up between two specific teams until Samurai's The Clash of the Red Rangers. Operation Overdrive's Once A Ranger has various rangers returning as opposed to a single team.
- Final appearance of Tommy Oliver.