Bowser is back

Bowser is back is the third episode of Season 1.

Plot
Mario and Vivian are chilling at Mario's House when Mario's pal Kooper comes to join Mario's party. Later, when the trio goes for a walk, they are ambushed by Bowser, who challenges Mario and Kooper to a battle. Later, Mario and Kooper defeat Bowser, who retreats. Vivian rewards the boys with a kiss.

Trivia
This episode introduces Kooper and Bowser.