Mario & Sonic Galaxy

Chapter 4- Little Lost Luigi

"Grrrrawwwwh, Mario and Sonic are ruining our plan Eggman what is your genius idea now..."
"Hohoho not to worry Bowser, for you see where Bowser Jr. Failed, Metal Sonic will not"
"..."
"doesn't talk much does he..."
"Metal Sonic you must go and recover the remains power stars if you can!"
"..."

Mario, Sonic and Co. Have scoured all across the galaxies new and old to see if any power stars that remained there were still but in their rush against Bowser they have collected all the ones available to them at this point.
"Hmmm"
"Hmph"
"Tails any ideas?"
"Uh yeah I think there is still one galaxy we haven't looked at yet Haunted Mansion Galaxy"
"A power star is there isn't it Tails?"
"I think so Shadow!"
"Ok, Mario looks like we..." Just as Sonic was about to finish his sentence he collapsed from exhaustion.
"Sonic has been running around too much he's used up most of his stamina nothing a rest and some chill dogs won't fix."
"Well Mario it looks like it's you and me"
"Okie Dokie Shadow lets a go"
As Shadow and Mario raced around the Galaxy finding power star after power star they noticed that Luigi was trapped there so they went to go rescue him until they realised that Shadow couldn't break down the doors to Luigi's cell but little did they know Knuckles was here in the Galaxy once again restoring pieces to the master emerald after Kamek had broken the Master Emerald to use its power to grant Bowser his power.

Wait till I get my hands on that koopa, that should be the last of them in this Galaxy man that was rough I wonder where Sonic and the others are...
"Knuckles we need your help to get Luigi out of the cell he's trapped in.
Knuckles broke down the door to Luigi's cell and was able to get out just as they were leaving they were attacked by Metal Sonic.

A battle raged on between Shadow and Metal Sonic one which unfortunately Shadow couldn't win Metal Sonic's power was far superior to his because of the power stars and the chaos emerald he had acquired was this the end of Shadow, Luigi, Knuckles and Mario?