Giant Ant Choju vs. Ultra Brothers (大蟻対ウルトラ兄弟 Dai Ari tai Urutora Kyoudai) is the 5th episode of Ultraman Ace. It features Ultraman Ace teaming up with Zoffy. This is also the first time Zoffy, the leader of the Ultra Brothers is seen fighting villains.
- Ultraman Ace Volume 2 features episodes 5-8.
- This episode was later featured in episode 43 of Ultraman Retsuden, "Bonds of Brothers! Ace and Zoffy!!".