The Elder Princess Shroob is the elder sister of Princess Shroob and the main antagonist of Mario and Luigi: Partners in Time. She is the de facto leader of the Shroobs although her capture meant that Princess Shroob took over in her place.
According to the prologue of the game, the Shroobs invaded the Mushroom Kingdom because their home planet is dying. Sometime before the game, they learned of the Mushroom Kingdom and deployed in their Shroob saucers to invade.
Mario & Luigi: Partners in Time[]
Princess Peach enters a time machine designed by Professor E. Gadd and ventures into the past - at the same time, the Shroobs captured the Mushroom Castle of the past. She is then faced by both Princess Shroobs. In desperation, she grabs the time machine's power source, the Cobalt Star, and manages to trap the Elder Princess Shroob's essence within it while shattering it. In this distraction, Peach is then captured by the younger Princess Shroob.
During the events of the game, Mario and Luigi believe that they should gather the shards of the broken Cobalt Star to be able to rescue Peach and defeat the Shroobs. The trapped Princess Shroob contacts the Mario Bros. and their past selves and pretends to be the spirit that resides within the star, telling them that if they gathered the shards, then they could defeat the Shroobs. The only person who sees through her masquerade is Baby Luigi, evidenced by his crying. Her true appearance is also "shown" via a poor drawing of Toadbert's before the attack by the Elder Shrooboid.
After the Mario Bros. defeat the younger Princess Shroob (the battle leaving her battered and on her deathbed), Baby Bowser drops into the room, steals the final Cobalt Star shard, and puts it together with the main Colbalt Star against Peach's objections. Princess Shroob then declares in her dying words it to be her sister's turn to face the heroes before collapsing dead, vanishing in a puff in an explosion. The Elder Princess Shroob frees herself and fights Mario, Luigi, Baby Mario, and Baby Luigi in vengeance for her sister's demise and sends them all high in the sky on a platform. Mario and Luigi manage to gain upper hand in the fight against Elder Princess Shroob with some assistance from Peach.
However, the cruel tyrant then taps into the power in her crown, and mutates, showing her true form, a sight so horrific that Peach collapses. The four heroes then have to defeat her by attacking her crown, which made her nearly invincible, then attacking the Elder Princess Shroob herself. After a long, difficult battle, the Mario Bros. and Baby Mario Bros. emerge as the victors. Although fatally wounded, the Shroob princess swears that the Shroobs will have vengeance and destroy the Mushroom Kingdom before turning into a small purple mushroom, which Baby Luigi claims.
When the Mario Bros. return to the Mushroom Kingdom's present, they find Bowser unconscious after he escaped the Thwomp Volcano. The mushroom that was once Elder Princess Shroob floats out of Baby Luigi's pocket, and into Bowser's mouth, turning him into Shrowser. The Mario Bros. defeat Shrowser, destroying Elder Princess Shroob's soul for good, releasing Bowser from her control and back into unconsciousness, ending the plague of the evil Shroobs once and for all.
Mario & Luigi: Bowser's Inside Story[]
During the optional battle with three Shroobs in Bowser's Castle, several Shroobs can be seen frozen in the background, including Elder Princess Shroob. She is frozen in ice by herself in Bowser's Inside Story, or with Princess Shroob in Bowser's Inside Story + Bowser Jr.'s Journey. This has given way too much confusion, as she was clearly destroyed at the conclusion of Partners in Time.
Villains