Ultraseven: S1 E43 - Nightmare On Planet No. 4 Ultraseven
TDF's automated space rocket "Scorpion" was undergoing a test flight. After awakening from a 20-day sleep, Dan and Soga arrived on Planet No.4 where robots ruled the residents. Dan and Soga meet the General Center Commander to find out that that Earth is in danger of colonization by Planet No.4.