Princess Shroob is the central antagonist for the majority of Mario & Luigi: Partners in Time. Hence her name, Princess Shroob is the second-in-command of an alien race, the Shroobs, though initially, it appears that she is their leader, although her sister Elder Princess Shroob really is. She resembles the rest of her race in color, but is taller with a proportionally smaller head, and wears a dress, similar to Peach's dress. She is the first of the two final bosses of the game and the game's sixth major boss.
In the past: The Shroobs have gotten tired of living on their planet and wanted a new home so Princess Shroob set off a full invasion of the Mushroom Kingdom to make it her own. She takes over Peach's Castle, turning it into the Shroob Castle. The castle towers were changed into tall purple mushrooms, along with all the pillars and bushes, and even a statue of herself got built.
In the present, the Professor E. Gadd made a time machine. The machine was first used by Princess Peach who goes to visit the Mushroom Kingdom's distant past. She unfortunately came into the time in which the kingdom was invaded by the Shroobs, so she got captured and imprisoned by Princess Shroob. A green Shroob then comes back to the present with the time machine, and was then unusable since the Cobalt Star has been shattered into 6 pieces. A while later, a tear in the space-time continuum, known as a time hole, opens, leaving a passageway into the past. While searching for Peach, Mario and Luigi locate their younger selves, and agree to locate the crystal shards, which are remnants of the Cobalt Star which had been shattered, since they were told that they needed five Cobalt Star shards to gain access to the Shroob Castle.
When Baby Mario, Baby Luigi, Mario, and Luigi rescue Peach in Gritzy Caves, she had a purple mushroom attached to her face. She is later revealed to be Princess Shroob in disguise who had the intention of taking over the present Mushroom Kingdom as well as the Mushroom Kingdom of the past. It seemed Baby Peach was the only one knowing as she cried at Princess Shroob's presence.
After acquiring five shards, the four Mario Bros. eventually make their way through the shroobified Peach's Castle and hijack a Shroob Battleship and engage the Shroob Princess in a dogfight. After blasting the Shroob Mothership out of the sky the Princess emerges from it. She then enters battle with them.
After she is defeated, Mario, Luigi, and their baby selves free Princess Peach. Mario and Luigi explained her that they were searching for Cobalt Star shards, after which Peach shows the last shard and tells them that she cannot allow them to reassemble the Cobalt star. Before she can explain, Baby Bowser, who was hiding in the Mothership, drops in, putting the last Cobalt Star Shard in the Cobalt Star. Peach then explains that Princess Shroob had a twin sister (who actually looks nothing like her, and is call Princess Shroob Elder so she could not be a twin [unless of course it means she was born a short time before this Princess Shroob]), and that Peach sealed Elder Princes Shroob in the cobalt Star, thereafter shattering it into pieces. Reassembling the cobalt star liberated Elder Princess Shroob from the cobalt star, destroying the cobalt star in the impact. Princess Shroob was thought to be the main villain for quite some time until her
Mario & Luigi: Partners in Time[]
It all started when the Planet Shroob was withering and dying, and in order to find a new place for their people, the two Princess Shroobs attacked the Mushroom Kingdom in the past. When Princess Peach (who was traveling back in time) trapped Elder Princess Shroob inside the Cobalt Star and broke it into shards, Princess Shroob took over as leader of the Shroobs. She launched a missile to take down Baby Bowser's Koopa cruiser in an attempt to kill him, Peach, and the Mario Bros. (both past and present).
Princess Shroob was next seen hosting a celebration about conquering the kingdom and fed Peach to Petey Piranha. When she discovered the Mario Bros, she sent Shrooboid Brat to defeat the Mario Bros, but they defeated him. Princess Shroob and her minions sent them falling into the caves below.
Mario, Luigi, Baby Mario, and Baby Luigi eventually entered the Shroob Castle (Peach's Castle in the past, taken over by Shroobs) and fought Princess Shroob. They eventually defeated her, but before she is destroyed in a brilliant explosion just like previous enemies, she claims that they will stand no chance against her sister. After Elder Princess Shroob is released, she swears to avenge her death.
Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey[]
Princess Shroob makes a cameo appearance in the game frozen in ice next to Elder Princess Shroob in the room with the optional boss battle against the three Shroobs. This is unlike the original Bowser's Inside Story, where only Elder Princess Shroob is seen.