Plague of Babies - S1.E18

When Zim’s Voot Cruiser has a mechanical failure and it sends Zim and Gir flying through the skies, Zim manages to gain control just in time to land safely in their headquarters. However, Zim is highly upset because a human baby saw the whole thing and despite Gir’s attempts to reason with him, Zim decides to go meet with the baby to see what he can do. However, Zim soon discovers the true nature of the baby and he must do everything he can to prevent them from accomplishing their goals.