Cosmic Clone

Cosmic Clones (or Shadow Clones) are shadowy duplicates of Mario or Luigi that appear in Super Mario Galaxy 2. Cosmic Clones are created once a certain point is reached in a galaxy and will follow behind Mario or Luigi, performing every movement the plumbers make.

Boards usually warn the plumbers that Cosmic Clones are present in the area, although they also appear when a Clone Comet orbits in a galaxy. Cosmic Clones are also able to walk where there is no platform if it is necessary for following Mario. Also, Cosmic Clones will do whatever Mario did, even if the landscape has recently been changed. If Mario or Luigi gets hit by one clone, he receives damage and the clone vanishes (which then the rest of the clones will mimic the plumbers from being damaged). Once the way out of the area where Mario or Luigi is in is revealed, they disappear screaming loudly for a few seconds and leaving behind three Star Bits each.

Locations

Galaxy	Mission(s)	Planet(s)	Duration of Chase
Sky Station Galaxy	Storming the Sky Fleet	Flipswitch Planet	Until Mario flips all the Flipswitches.
Spin-Dig Galaxy	Silver Stars Down Deep	Starting Planet	Until Mario shatters the Item Crystal containing the Sling Star.
Fluffy Bluff Galaxy	Search for the Toad Brigade Captain	Pond Planet	Until Mario collects all the Star Chips.
Puzzle Plank Galaxy	Purple Coin Shadow Vault	Three Pillars Planet (Inside)	Until Mario collects all the Purple Coins.
Cloudy Court Galaxy	Silver Stars in the Purple Pond, The Shadow Lining	Poison Swamp Planet Starting Planets Castle Wall Planet	Silver Stars in the Purple Pond - Until all of the Silver Stars are collected. The Shadow Lining - Until Mario shatters the Item Crystal containing the Power Star
Haunty Halls Galaxy	Spooky Cosmic Clone Chase	Disappearing Paths Planet	Until Mario shatters the Item Crystal containing the Power Star.
Chompworks Galaxy	Cosmic Clones in the Chompworks	Rising Platforms Planet	Until Mario guides the Golden Chomp into the hole.
Mario Squared Galaxy	Luigi's Purple Coin Chaos	8-Bit Luigi Planet	Until Mario collects 100 Purple Coins.
Flip-Out Galaxy	Cosmic Clone Wall Jumpers, Green Star 2	Second Wall Jump Planet	Until Mario shatters the Item Crystal containing the Power Star.

Trivia

• The Cosmic Clone's theme is a remix of the Super Mario Bros. overworld and underground theme, like Cosmic Mario's (or Cosmic Luigi's) theme from the prequel.
• Cosmic Clones also share the same tone of voice as Cosmic Mario's and Cosmic Luigi's: a high-pitched voice that is strikingly similar to Bowser Jr.'s, and another trait is that Cosmic Clones look like Cosmic Mario or Luigi, but Cosmic Mario or Luigi cannot hurt the brothers, and they have a starry display and their bodies are blue.