Phineas and Ferb is an animated childrens series that airs on Disney Channel and Disney XD. The show is about two stepbrothers named Phineas Flynn and Ferb Fletcher who make everyday of summer an adventure, while their older sister, Candace Flynn tries her to show her mother what the boys do, but to no avail. Their pet platypus, Perry, is a secret agent who battles the forces of evil daily. The series' first movie, Across the 2nd Dimension, aired on August 5th on Disney Channel.
- Phineas Flynn: One of the titular characters. Normally bright and optimistic, Phineas seeks to make everyday of summer a great day, and uses his intelligence to concoct ideas to build things for fun.
- Ferb Fletcher: The other titular character, and Phineas's stepbrother. A quiet fellow, Ferb is more of a man of action, and helps to make his brother's ideas a reality with his impressive construction skills.
- Perry the Platypus: The titular characters' pet. He goes undercover as a secret agent for the Organization Without a Cool Acronym as Agent P, and fights the forces of evil daily. His owners don't know his idea, and think that he is just a mindless pet who doesn't do much. That is, until one fateful day...
- Candace Flynn: Phineas's sister and Ferb's stepsister. Candace tries to bust her brothers for the grand things they do, but her plans end in vain. When she isn't, she acts a regular teenager, stressing out over her boyfriend, talking with her friends over the phone, or going shopping.
- Heinz Doofenshmirtz: An evil scientist, and Agent P's arch-nemesis. Doofenshmirtz makes daily attempts to take over the Tri-State Area, but is more than often stopped by the secret agent monotreme. When he doesn't try to execute his plots, he deals with his teenaged, goth daughter, and his divorced wife.
- Francis Monogram: Agent P's boss, who briefs him on his mission for the day before he goes to stop Doofenshmirtz.
- Linda Flynn-Fletcher: Phineas & Candace's mom, and Ferb's stepmother. Candace tries to get Linda home to see what the boys have built in the backyard, but Agent P and Doof's duelings often cause the inventions to disappear, leaving the mother clueless and Candace looking like a fool.
- Lawrence Fletcher: Ferb's father, Phineas & Candace's stepfather, and Linda's husband. He fancies nostalgic and antique things.
- Isabella Garcia-Shapiro: The girl across the street. She has a crush on Phineas and leads the Fireside Girls scout. She often helps the boys in their daily activities.
- Buford Van Stomm: The town's resident bully, but can show a soft side at times. He also helps with activities.
- Baljeet: An Indian nerd, and the boy that Buford often picks on. He helps with activities as well.