Horror! Mansion Monster's Birth (戦慄! マンシヨン怪獣誕生 Senritsu Manshiyon Kaijū Tanjō) is the twenty-fourth episode of Return of Ultraman.
A little space monster Kupukupu fell in Shinshu. MAT captures it and decides to destroy it before it grows violent. When they kill it, a young boy Akio gets a fragment of Kupukupu's body and takes it back home. The piece melts into the wall of the boy's room and becomes a giant monster - Kingstron!
- Return of Ultraman Volume 6 features Episodes 21-24.