Plot
The special begins with Linus roller-skating all over town. On his way back from a birthday party, he passes by a garden where he hears someone singing ("O Mio Babbino Caro") As he enters the garden, he learns that a little girl named Mimi is the person that was singing. After Linus and Mimi spend time gardening together, Linus invites her to his birthday party, and she accepts the invitation. Linus keeps hearing Mimi's singing voice everywhere he goes and can't seem to stop thinking about her. As Linus is writing his guest list for his birthday party, Lucy asks who Mimi is.
Plot
 The special begins with Lin roller-skating all over town. On their way back from a birthday party, they pass by a garden where they hear someone singing ("O Mio Babbino Caro") As they enter the garden, they learn that a little girl named Mimi is the person that was singing. After Lin and Mimi spend time gardening together, Lin invites her to their birthday party, and she accepts the invitation. Lin keeps hearing Mimi's singing voice everywhere they go and can't seem to stop thinking about her. As Lin is writing their guest list for their birthday party, Lucy asks who Mimi is.