Super Mario Bros. X-2: Invasion of Sea Side

This is the prequel of Super Mario Bros. X: Alternate Kingdom and Super Mario Bros. X: Sea Side Adventure taking place less than 20 years prior. Its title is not really confirmed yet. I intended to name it "Super Mario Bros. 3 II" as Super Mario Bros. 3's sequel or the Invasion 3 since the game's plot is also going to be similar to that of Super Mario Bros. X's Invasion's series.

Like Sea Side Adventure was intended to take place in a timeline after Super Mario World (right after Wario Woods), this title is set to take place a few years after that fifth Super Mario title long years before Alternate Kingdom and Sea Side Adventure, revealing Toad's travels while Mario and Yoshi were venturing.

This is also about King Varun, the Sea Side and Princess Marina's youth (do not get betrayed by her appearance, she's still supposely an adult). The truth behind King Varun's new clothes and his nickname will be revealed as well. It'll also have new antagonists and enemies that haunt the world so King Varun must defeat them. Sea Side will not be the same as Super Mario Bros. 3 but as a different kingdom with new landscapes like its sequel (though the new landscapes from Sea Side Adventure are big lands which were meteors that fell around the Sea Side Kingdom and evolved by a Star Rain). It'll also mark the return of a few characters from Alternate Kingdom, like Marvin and Doshi, who were friends with King Varun.

King Varun (Sea Side King), Kamek the Evil Magikoopa, Toad, Stuffwell, the Mario series and the Yoshi series © from
Goldian Duck, Master Doshi, Princess Marina, Prince Darth, Super Mario Bros. X: Alternate Kingdom, Super Mario Bros. X: Sea Side Adventure, Super Mario Bros. X-2: Invasion of Sea Side and the Super Mario Bros. X series © from and Prince Ludwig.