Mario & Luigi: Partners in Time

"The famous Mario Brothers return in this sequel to the humorous Superstar Saga. In this adventure, Princess Peach takes a trip in a time machine, but when it returns, there's only a monster inside! The heroic brothers travel back in time only to discover that evil alien life forms known as the Shroobs have taken over the Mushroom Kingdom, and no-one is safe! They soon meet up with their younger selves, and set out to stop the alien menace, not to mention rescue the Princess!"