Ultraman Ace: S1 E48 - Revenge Of Verokron
Hokuto suffers from a toothache and has a nightmare about being attacked out of revenge by Terrible-Monster Verokron. Right after this dream, he witnesses a phantom of Verokron. He shoots the TAC Gun in the city, and is suspended from the team. This is all an assassination plan against Ace, planned by the Yapool remnants.