Lacie appears visually as part of the crowd helping Vanessa navigate the local music scene. "Brain Drain"
On the Wikifanon Wiki , the character is featured in various fan-made episode transcripts and stories, such as "Not Creepy Enough" and "The Sick Day Video Game". General Show Reviews (Official Series) lacie phineas and ferb
— Now go make your own “inator-proof” backup system. Lacie appears visually as part of the crowd
She is generally friendly to them. Unlike Candace, she thinks their inventions are cool. she interacts with him more directly.
Stacy actually has a surprising connection to the main villain. In the episode "The Secret of Success," she unknowingly goes on a drive with Dr. Doofenshmirtz. Later, in the finale movie Phineas and Ferb: Candace Against the Universe , she interacts with him more directly.