Super Mario Galaxy 2.5

A month after defeating their nemesis, Bowser, Mario and Luigi are sleeping in their house, when Mailtoad comes to his door with a letter reading: Dear Mario, We will be be passing over your world in the Starship. The Lumas and I will meet you in the town square. - Lubba. Happy to see that their old friend was back, Mario and Luigi start off to Peach's Castle. On the way, they stumble upon Mario's hat, the one that he lost during the departing Baby Luma. Picking it up, Mario finds Baby Luma inside with a new letter. This time, with different handwriting. Dear Mario, There is a HUGE problem where I am right now, which I don't have a clue. Anyway, that monster that you battled is back, and bigger than ever! HELP! -Lubba. Mario and Luigi thought for a moment, and then with Baby Luma in tow, headed to Peach's Castle. Arriving, the bros. found Bowser, looming over them, and suddenly discovered that the first letter was a trick. Bowser grabs Princess Peach and flies into the galaxy. Mario, Luigi, and Baby Luma seek help from a couple Lumas, that blast them into space. Mario finds himself reunited with Lubba and sets out to save Princess Peach, meeting many new and old friends along the way.