Linus has to break devastating news, his father has a new job and has to relocate his family. Charlie Brown and the gang make their goodbyes and prepare for Linus and Lucy's departure.

As they begin their journey home from their student exchange term, Charlie Brown and the gang find themselves sidetracked. They have severe car trouble and more importantly, they pass by various monuments to World Wars I & II. With Linus guiding them through these memorials, they learn about the events of the wars and the sacrifices required of the troops who fought them.

It's Three Strikes, Charlie Brown is from the later phases of the Peanuts TV-special saga. Instead of concentrating on a single story (a la A Charlie Brown Christmas), this half-hour animated effort offers eight separate anecdotes. All are derived from continuities originally presented in Charles Schultz' Peanuts comic strip, and all were first telecast on the Saturday morning TV series The Charlie Brown and Snoopy Show. And, re the blanket title, all are unified by a central "baseball" theme. The best sequence in It's Three Strikes, Charlie Brown finds the canine Snoopy assuming a managerial post on the opposing team.

The relationship between Lelia, a light-skinned black woman, and Tony, a white man is put in jeopardy when Tony meets Lelia’s darker-skinned jazz singer brother, Hugh, and discovers that her racial heritage is not what he thought it was.