Super Mushroom vs. Super Star

Super Mushroom (Super size) vs. Super Star (Invincibility) is a Splatfest event in Splatoon 2. It will be held globally in January 2021 to celebrate the 35th Anniversary of the Super Mario series. It was announced during a Nintendo Direct on 2020-09-03. It is the first Splatfest with an original theme since the officially dubbed final Splatfest, Chaos vs. Order.

Details
The Splatfest theme is about two power-ups from the Super Mario series: the Super Mushroom, which grants super size, and the Super Star, which grants invincibility.