The episode opens with Eric sitting inside his office at Misfits Music, watching Lin-Z TV on his flat screen. It has just been announced that Jem and The Holograms are headlining the "World History of Music Concert", which facilitates bands from all over the globe to celebrate music. Almost immediately after hearing the news, Pizzazz phones up Eric to demand that he gets The Misfits to headline instead. He informs her that Techrat's new device would be able to help with this.
Shortly after, Jem and The Holograms are practicing their song "Rock And Roll Is Forever", and Jem suggests the song isn't quite big enough to do justice in remembering every great musician. Even though the song was written by Bobby Bailey, an influential rock musician in the series, the group go to Synergy for advice. While they are discussing this, The Misfits and Eric have met up with Techrat to see his latest creation, which is a time machine which he sets to Vienna in 1781, and The Holograms disappear within seconds along with Synergy. Consequently, a woman appears inside Techrat's technology truck, dressed in periodic clothing, looking for her beloved "Wolfie". Techrat then explains that there is one minor flaw in order for the machine to work seamlessly; if people are sent back in time, there must be an exchange in body mass, and therefore they must receive people from the past.
The Holograms arrive in Vienna, but are confused as to their whereabouts, and Jem has changed back into Jerrica. Jerrica manages to make contact with Synergy, who informs them she is stuck in the basement of an unknown building, but is using her battery power to restore Jem's hologram. With the help of Synergy's technology, the group can determine their location and date, and are also provided with period-appropriate attire. A man enters the room, searching for "Constanza", and introduces himself as Wolfgang Mozart. He performs a small part of his composition to The Holograms, and explains that his rival Solieri plans to stop him from performing his sonata at the royal concert that evening. They help him leave by distracting Solieri's henchmen with Shana disguised as a hologram of Mozart, while the real one slips out the back door and heads to the concert venue. The henchmen kidnap Jem and The Holograms, and at the venue Solieri announces that with Mozart's failure to arrive, he will be performing instead. However, he manages to thwart Solieri's plans, and the concert goes as planned. Jem uses Synergy to project a hologram of a band of thieves ready to attack the carriage they are in, and the scared henchmen flee. They head to the concert just as Mozart finishes performing, but suddenly start to glitch back into their original selves as interference affects Synergy's projections, and they are accused of being witches.
Techrat changes the date on the machine due to Constanze becoming an issue, also luckily saving Jem and The Holograms from harm. In Constanze's place appear two British soldiers questioning if they are still in London, where they traveled from. Jem and The Holograms travel to London in 1944, which is pointed out by Shana who sees a poster advertising the Ben Tiller Band - "the greatest band of the swing era". With the help of Synergy yet again, they wear period-appropriate clothing. Two soldiers approach the girls and offer them to watch their rehearsal since they're fans of the Ben Tiller Band, but laugh at the fact they are a female band. After meeting Ben Tiller, The Holograms make a deal to perform with the Ben Tiller Band, singing the song "We're Making It Happen". Suddenly as the song ends, bombs start to detonate outside the venue and they run to safety. Again, Techrat fiddles with his device to send back the two soldiers, and saves Jem and The Holograms from being crushed by rubble in the process.
The date is changed for a third time, and the soldiers are replaced by four hippies from the 1960's. Techrat, after receiving insults from the Misfits, decides to send them along with The Holograms to 1969. The Holograms meet Johnny Beldrix, "the legendary rock guitarist", and he tells them they are at Woodstock festival. They soon learn that the Misfits are a part of the time travel scheme when Johnny tells The Holograms that his concert promoter is forcing him to perform with the Misfits. Jem offers to help Johnny get out of the contract, and asks Synergy for an update, who is stuck inside of a truck. The Holograms discover the Misfits lounging around discussing their excitement about Woodstock, and confront them about how they all ended up here. Jem leaves to create a hologram of Eric, who reminds the Misfits that they're already signed, and the music promoters fires them. Johnny plants a kiss on Jem's cheek, and goes onto perform a guitar instrumental of The Star-Spangled Banner at the concert. To The Hologram's surprise, Synergy is being lowered onto the stage by the crew, at which moment Pizzazz decides to push the music promoter into a set of drums, and pulls a lever which causes Synergy to hurtle toward the ground. Before she hits the ground, Techrat brings them all back to present day and The Holograms celebrate. The Misfits, however, are annoyed with the innocent Eric who they saw at Woodstock, and Pizzazz sends him to a year where dinosaurs were still around, because a baby Diplodocus takes his place. The dinosaur completely destroys the tech truck, and just before the time machine stops working altogether, Eric is brought back to 1987.
Later, Jem and The Holograms honor the great musicians of the past by sharing the name of the artists they met on their journeys, and perform "Rockin' Down Through Time" which was clearly inspired by each year they traveled to.
In the music video for "Rock And Roll Is Forever", Aja is placed onto a Japanese flag and wears Japan's traditional dress, although she is half Chinese, not Japanese.
Like in the Jem Jam episodes, the names of the characters based in real life figures portrayed in this episode use different names (probably to avoid copyright issues):
Antonio Salieri and Mozart in real life were also rumored enemies, with gossip that Salieri hated Mozart and even attempted to poison him. This fictional murder plot was depicted in Peter Shaffer's successful 1979 play, Amadeus.
The show's portrayal of Mozart is likely inspired by Tom Hulce's portrayal of Mozart in the film adaptation of the play, including the character's high-pitched laugh.
In the journey to 1781, The Holograms can hear a small part of Mozart's Piano Sonata No. 11 In A, K331 being played in the background, although the real Mozart actually composed this in 1783.
In 1969, when Beldrix takes to the Woodstock stage, he performs "The Star-Spangled Banner" on electric guitar, similar to his real-life counterpart, Jimi Hendrix.
The trailer where Synergy is transported during the 1969 Woodstock festival story is very similar in design to Optimus Prime's vehicle form in the original 1984-87 The Transformers animated series, also by Sunbow Entertainment, only with different colors (the truck is purple with orange stripes and the car is also orange).
Another trailer with a similar resemblance to Optimus Prime appears later in the episode Out of the Past (although once again with different colors).
