It's got Spongebob. It's got the Teenage Mutant Ninja Turtles. It's got Reptar.

Nickelodeon All-Star Brawl is about as close as you're going to get to a Nickelodeon themed Smash Bros. game without actually being a Smash Bros. game. Unlike Smash Bros., which are only ever released on Nintendo platforms, Nickelodeon All-Star Brawl is coming to the PlayStation 4, PlayStation 5, Xbox One, Xbox Series X|S, and the Nintendo Switch in Fall 2021.

It's being developed by Ludosity and Fair Play Labs. It'll be published by GameMill Entertainment.

This game will feature 20 levels based on various Nickelodeon properties, including the Jellyfish Fields from SpongBob SquarePants, and the Technodrome from Teenage Mutant Ninja Turtles. It will ship with both single player and multiplayer modes, and feature both local and online support for up to four combatants. You'll even be able to unlock new moves for your favorite fighters and even unlock some in-game gallery content.

Speaking of the fighters, here are a list of the currently known characters you will get to choose from. From my understanding, this is not a complete list.