When Doof decides to go to Gravity Falls for some "fresh air," he discovers a strange journal of the supernatural. Meanwhile, Perry makes sure the Flynn-Fletcher family follows him there, where Phineas and Ferb team up with their new friends Dipper and Mabel to explore more anomalies. However, fun becomes sinister when Bill Cipher tricks Phineas into making a dangerous deal.

When Marty McFly and Doc Brown receive a letter to rebuild the DeLorean and return to November 12, 1955 from someone called the Doctor, they both assume it's from a future Doc. However, Marty soon discovers the Doctor is different person entirely– and he has bad news. There are Weeping Angels in Hill Valley– and they're after Marty.

The Doctor lands somewhere on Earth in the early twenty first century, where he instantly meets two boys. Hoping to impress, and rekindle their imaginations, he tells them he's been to space. What a surprise when he finds out they've been there too— multiple times, in fact! Shockingly enough, he finds out there's little he's done, that they haven't done also. Current Doctor: 11

When Johnny blows up his street, the Test family and their neighbors have to relocate to Danville until the houses can be rebuilt. Meanwhile, Doofenshmirtz strikes up an alliance with Dark Vegan, Candace tries to prove Phineas and Ferb are better than Susan and Mary, Buford and Bumper disagree on who the meanest bully is, and Isabella and Sissy compete to see which troop is better.