S1·E2 Stowaways

Onboard the freight ship to Tehaisa, Kaiba is now a stowaway amongst the packages, when he gets acquainted with another stowaway named Kochu and her boyfriend Butter. Later on planet Lala one of the memory tanks explodes, causing the memories of 200,000 people to leak into the sky and the suspect is the same person in Kaiba's locket.