4x11 - Cow and Chicken

Cow and Chicken visit their cousin, Snail Boy for Sunday Dinner. Later that night, Mom's Sis announces that Snail Boy has been transformed to Cow and Chicken's school. During his first day of school, Chicken becomes the laughing-stock when every finds out that Chicken is the cousin of a snail. Snail Boy then becomes the target of the eyes of the bullying track team.