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AlphaDream Corporation, Ltd., or AlphaDream (formerly known as AlphaStar), was a Japanese video game development studio who were responsible for developing games for the Game Boy Color, Game Boy Advance, Nintendo DS, and Nintendo 3DS. AlphaDream had developed all five games in the Mario & Luigi series, along with Mario & Luigi: Superstar Saga + Bowser's Minions, a remake of the first game in the series, and Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, remake of the third game in the series. The company's staff included prominent developers from Square Co., such as Chihiro Fujioka.
On October 1, 2019, the company ceased operations immediately after filing for bankruptcy, citing sluggish revenues and the high development costs exceeding overall debt.
The company was founded on January 12, 2000, as a second-party developer for Nintendo. Their first game, Koto Battle: Tengai no Moribito (Japanese: コトバトル－天外の守人), was only released in Japan for the Game Boy Color on March 9, 2001. Their first Mario game, Mario & Luigi: Superstar Saga, has drawn heavy inspiration from Tomato Adventure, their second and last RPG game, which includes borrowed art style, strong resemblance of characters (such as Hermie III being based on the "Yadotsuri" enemy) and similar sound effects. In fact, some files from Tomato Adventure's soundtrack is found unused in Mario & Luigi: Superstar Saga's files.