|First Appearance||Mario Kart Wii|
|Latest Appearance||Mario Kart ULTIMATE|
|Shrinks a player who has it long enough without passing it on.|
The Thunder Cloud (also known as the Lightning Cloud) is an item most commonly found in the Mario Kart series. It causes a cloud to grow over the player, after which a fifteen second clock starts ticking. The player can bump in to another racer to pass it on, but if he is unable to, then he will be shrunken after the fifteen seconds are up.
In the Mario Kart Arcade GP games, the Thunder Cloud's use is very different. Instead of its hot potato-esque use in Mario Kart Wii, the Thunder Cloud can be used by player input only. When used, the Thunder Cloud locks itself onto a nearby opponent and slows them down tremendously with a thunderstorm, which doesn't shrink them at all. It is seen as a heavier version of the Rain Cloud from the same games.
Dry Bones Kart series
The Thunder Cloud debuts in the Dry Bones Kart series as a newcomer to Dry Bones Kart Wii. What he does is appear above the recipient's kart and gives him a decent speed boost. However, after ten seconds, he will shrink the recipient to a tiny size.
Future Dry Bones Kart Installments
The Thunder Cloud returns in future Dry Bones Kart installments, playing the same role as he did in his debut.
Mario Kart series
The Thunder Cloud appears as a normal item in Mario Kart ULTIMATE and is obtainable by everyone. It does the same effect as it did previously in Mario Kart Wii.