HBO Max is loaded with Cartoon Network classics, deep cuts, and new gems — perfect for a nostalgia-fueled binge this weekend.

In January, the characters of the FX series It's Always Sunny in Philadelphia showed up as court-appointed volunteers on an episode of the ABC sitcom Abbott Elementary. The crossover continues July 9.

Cartoon Network is a treasure trove of since-ended shows, and this week, the channel is airing some of our favorite throwback ...