Bēda Capsule

The Beta Capsule (ベーたカプセル, Bēta Kapuseru) is a hypothetical power-up that appears in Super Mario-kun volume 1 as the last new power-up Mario comes across in the possible Super Mario Bros. 5. The Capsule looks like a laser pointer with a silly face on the top and a button right under, that activates the transformation.

After getting beaten by Bowser's new Koopa Clown Car, Isshī passes Mario the Beta Capsule, transforming him into Mega Mario.