ReBoot(1994 - 2001)
Deep inside your computer lies a virtual world where cities inhabited by Sprites and Binomes. Normally, they'd live peacefully, but The User (from their perspective, a god-like figure) of their systems tests their mettle by sending Games into the system. Only the most elite should enter a game, and everyone else should evacuate the sector the Game Cube landed on. The consequences for The User winning a game are the complete nullification of the sector it landed on along with anyone caught inside the game. While in the game, Sprites and Binomes have the ability to ReBoot, which is to download useful skills, weapons, and tools into their own code so aid them in their fight against The User.
Outside of games, more danger lurks in the form of Viruses, who come in many shapes and forms. Some love to infect others, which forces the victim to become a loyal servant of the Virus. Other would prefer to delete other programs, reveling in the destruction of innocents.
Luckily, there is a group of called The Guardian Collective, whose motto is mend and defend.
(Matrix Intro #2)
(Matrix Intro #1)
Cartoon Network's original ReBoot intro for its fourth season.