Ferbs "Ferb" Fletcher is a fictional character and the titular co-protagonist of the animated television series Phineas and Ferb. Voiced by British actor Thomas Sangster in Phineas and Ferb's original run and the film Across the 2nd Dimension (2011), American actor David Errigo Jr. in the Milo Murphy's Law episode "The Phineas and Ferb Effect", the film Candace Against the Universe (2020), and Phineas and Ferb's revival run, with a singing voice by series composer Danny Jacob, he was created by Phineas and Ferb founders Dan Povenmire and Jeff "Swampy" Marsh. He first appeared in the show's pilot episode, "Rollercoaster".