Ultraman (1966): Season 29, Episode 13

29 - 13: Restore Memories

Riku Asakura and Pega were goofing around & playing Baseball inside the Nebula House. RE.M. had warned them to be pessimistic but during their game, the ball hits Rem, causing her to malfunction and the result from the hit had also cause RE.M. to loses all of her memories.