The Cobalt Star in one piece

“Themachine's energy source? This amazing Cobalt Star!”

—In-game text,Mario & Luigi: Partners in Time

TheCobalt Star is the power source forProf. E. Gadd's time machine inMario & Luigi: Partners in Time. The Cobalt Star is shattered into multiple shards byPrincess Peach after she uses it to trap theElder Princess Shroob, the leader of theShroobs that are invading theMushroom Kingdom of the past. However, her sister, the youngerPrincess Shroob, kidnaps Peach in the castle of the past, which is later turned intoShroob Castle. Destroying the star also causestime holes to appear between the past and present. Meanwhile,Baby Bowser collects the shards of the Cobalt Star as his personal treasure, going great lengths to protect it. With the help of their infant selves,Mario andLuigi go about retrieving the shards and reassembling the Cobalt Star to fix the fabric of time and save Peach from the Shroobs. They find the first one inBowser's Castle, although this causes Baby Bowser to pursue them. After finding the second shard in theVim Factory, Baby Bowser steals the shards and flees toYoshi's Island, where the Mario Bros. give chase and retrieve the shards from him after defeatingSunnycide. Later in the game, atStar Hill, the "spirit of the Cobalt Star," which is actually the Elder Princess Shroob in disguise, sends the heroes to theStar Shrine, where there is another Cobalt Star shard.

The "spirit" of the Cobalt Star

Baby Luigi andKylie Koopa both realize something is suspicious about the Cobalt Star, with the former crying after he noticed something inside, but the whole truth is not revealed until it is too late: All of the shards are assembled at Shroob Castle when Baby Bowser steals the last one from Peach. Baby Bowser is transformed into aShroob mushroom, and the Elder Princess Shroob then uses her regained power to break free of her prison and attack the heroes.

When the Cobalt Star shard goes near theJunior Shrooboid, the sound that aShroob saucer makes is heard.

Cobalt Star shard locations[edit]

A Cobalt Star shard

Below is a list of where the six shards of the Cobalt Star are located.

• In theTreasure Chest Block of the pastBowser's Castle. Until meeting withProfessor E. Gadd atPeach's Castle, this is treated as a normal key item with the nameSparkling Shard.
• In the possession ofSwiggler in theVim Factory.
• InsidePetey Piranha in theGritzy Caves.
• At theStar Shrine.
• In the possession ofToadbert and thenElder Shrooboid at the Star Shrine.
• In the possession ofPrincess Peach atShroob Castle.

Names in other languages[edit]

Cobalt Star[edit]

Cobalt Star shard[edit]

• Stars
• Mario & Luigi: Partners in Time items

• Articles with unsourced foreign names