Unlimited Power (comics)

"Unlimited Power" is a 2020 crossover comic book event by Boom! Studios, based on the "Power Rangers" franchise by Hasbro. The event is written by Ryan Parrott through the comic book series "Mighty Morphin" and "Power Rangers", making it the third crossover event in the "Power Rangers" comics by Boom! after 2018's "Shattered Grid" and 2019's "Necessary Evil". 
Publication history.
On July 2020, Boom! Studios announced the 2016 "Mighty Morphin Power Rangers" comic book series would conclude on October 2020, with a new event titled "Unlimited Power" being presented through two new separate series to debut on November 2020.
In addition to the event, a one-shot issue titled "Power Rangers Unlimited: Heir to Darkness" will be released on March 31, 2021. Another one-shot titled "Power Rangers Unlimited: Edge of Darkness" will be released on June 30, 2021.
Background.
Mainstream universe.
In the mainstream universe, after the defeat of Kiya and the Anointed, Lord Drakkon (who survived his time within the Morphin Grid) is sent back to Earth, where the Power Rangers locked him up in the Command Center. Lord Zedd reunites with his minions in order to recruit a clone of Rita Repulsa and use the Chaos Crystal to turn them into his own "Dark Rangers". Grace Sterling helps Billy Cranston on repairing the Green Power Coin for a new candidate. Meanwhile, Zedd sends his new Dark Rangers to attack Angel Grove to attract the Power Rangers. After a brief battle, only the Rita clone defeats Tommy Oliver. Zedd then uses the Chaos Crystal to summon the Terrorzords, and the Power Rangers are almost defeated, but a mysterious Green Ranger, who was recruited by Grace Sterling and Promethea for the Green Protocol, destroys Zedd's Chaos Crystal, enabling the Power Rangers to defeat the Dark Rangers, who lost their powers in the process.
Meanwhile, the Omega Rangers travel to the planet Gorvinos III to return its people, only to find it in ruins. Then a mysterious figure appears, and reveals itself as a member of the Empyreal, a race that has decided to wipe out the universe entirely. The Imperyal defeats the Omega Rangers, causing them to flee to Earth.
Alternate universe.
In the alternate universe, everyone believes Lord Drakkon is dead, and the Ranger Slayer tries to make amends with her past, which leads to confront Scorpina, the new Commander of Drakkon's Ranger Sentry army. After a hard talk, Slayer gets the trust of the Coinless, but they are attacked by zombies lead by the ghost of Rita Repulsa, who was summoned by Trini Kwan as a desperate measure to end their war, to no avail. Slayer has later convinced the Sentries to join forces with the Coinless to fight Rita's army. Trini and Scorpina succeed on trapping Rita on her staff, causing the zombies to vanish. Slayer is chosen by everyone to take Drakkon's place as the new leader of the Sentries.
As Slayer tries to adjust herself into her new role, the aftermath of Drakkon's rampage seems to be irreparable. After having an altercation with a Coinless rebel, Adam Park suggests locking him in the Deathlock, a special prison made by Drakkon, leading Slayer to go there and free all the prisoners inside. As she releases a man inside a Ranger armor, he desperately reveals her actions activated a signal, sending a message that allows an army of space monsters to conquer the world in case Drakkon was defeated. After being freed from his armor, the prisoner is revealed to be Jason Scott, and Scorpina reveals that the invading creatures that lead by Eclipta, an emissary of Dark Specter. Jason suggests removing the Power Coins from the Deathlock's disruptor but the others refuse. However, during the battle between the Sentries and Eclipta's army, Jason removes the Coins anyway, causing the Sentries to lose their powers. However, Slayer convinces him it is no longer the right way to do, but she gets the idea to use the remaining Power Coins on an reactor to spread the Morphin Energy around everyone. They attack a growned Eclipta until the reactor explodes, but Eclipta is already taken down by the Coinless and the Black Dragon Army, now reformed as the "Shattered". While Slayer begins to rebuild Angel Grove, Andros informs Dark Specter about Eclipta's defeat.
Plot.
The fracture among teams.
While most of the Power Rangers discuss who the new Green Ranger is, Goldar, Finster, Squatt and Baboo discuss what to do with Lord Zedd, who got unconscious after the Green Ranger destroyed the Chaos Crystal. Meanwhile, Skull's girlfriend Candice is in fact a citizen from Zordon's planet, Eltar, and is tasked with a mission by the Guardians of Eltar. When the Omega Rangers return to Earth, they ask Zordon for the help of Lord Drakkon, who knows many things about the Empyreals. When Zordon refuses, the Omega Rangers have no choice but to go rogue and free Drakkon from his prison, causing friction with Zordon and Alpha-5.
The Power Rangers' side story.
After the outbreak, the Power Rangers discuss whether it was the right decision or not, and Zordon begins to hire bounty hunters to capture the Omega Rangers. During a visit to a fun fair, Candice is chased by humans transformed into Putties by Lord Zedd. Retreating from that battle, Zordon discovers that the new Green Ranger works for Promethea, leasing him to have an argument with Grace Sterling. Back in the battle, the brainwashed Putties fuse into a giant version. When Skull gets unconscious for the battle, Bulk confronts Candice about keeping secrets from them, which leads her to go to Zordon and expose her true identity as Zenya of Eltar. The Green Ranger intervenes to help the Power Rangers and defeat the giant Puttie, but Zedd uses the Chaos Crystal to lock Angel Grove in a force field. In the end, the Green Ranger, through a public transmission, reveals himself as Matthew Cook to the world.
Matthew explains how Promethea recruited him to use the Green Power Coin and become the new Green Ranger. When Zedd locks Angel Grove inside the force field, he gets the idea to expose his identity to get people's trust. The Power Rangers try to deal with how Zedd could chase their families if their identities were revealed, until Grace calls for help to prevent the military forces from destroying the city. At the same time, the Rangers confront Matthew and Goldar.
The Omega Rangers' side story.
After the outbreak, the Omega Rangers are the run while searching for the Shattered Grid with Drakkon's help, when the ship was powered down. The Omega Rangers think it was Drakkon doing it, it turned out it was caused by the Horrid, a race of vampire-like creatures that suffered their transformation after trying some experiments that lead their planet to be destroyed. In an effort to buy time, Drakkon pretends to betray the Omega Rangers into order to kill the Horrid King. After the encounter, they all arrive in the Morphin Grid, which is corrupted with Drakkon's nightmares. After arriving, the team evades the spirit manifestations that used to guard Drakkon and retrieve the rests of the Red Emissary's corpse. Xi scans the body and deduces it is missing a piece to put it back together. Drakkon suggests travelling to Onyx, a planet filled with mercenaries.
During their mission on Onyx, Jason and Zack are ambushed by Astronema, and the three taken into custody by S.P.D. officers, causing Astronema's mentor, Ecliptor, to seek Trini, Xi and Drakkon for help.
Astronema's side story.
On an alien planet, Astronema killed a team of Power Rangers before returning to her ship. She then remembers the time when Ecilptor trained her to become ruthless. Upon arriving at the planet Mortane, Astronema and Ecliptor enter the capital Crucius to train for a match. Unbeknown to Astronema, she had his memories altered, making her believe her family was murdered by Power Rangers for allegedly serving Dark Specter. After winning her death match against Darkonda's protégée, Astronema was chosen as the new Princess of Evil, as she gives orders to travel to Onyx, where the Omega Rangers are. 