Neptune Beyond the Closet (おし入れの向うは海王星, Oshiire no Mukou wa Kaiousei?) and The Confusing Dinosaur Age (ハチャメチャ恐竜時代, HACHAMECHA Kyouryuusei Jidai?) are the two segments of the 8th episode of Urusei Yatsura. The episode originally aired on 9 December 1981. Its opening theme is Lum no Love Song and its ending theme is Uchuu wa Taihen da!.
First appearance of Oyuki, Lum's friend and queen of Neptune. Oyuki also has incredible ice powers. Megane and friends visit while Shinobu is nursing Ataru, who has a cold; and they discover a gate to Neptune in Ataru closet. By accident, they go through this gate and arrive on Neptune to be greeted by Lum and Oyuki.
While Ataru is flying an ultra-light, with Lum and Jariten tagging along, Kintaro crashes into him. With the help of Lum's electric shock, the crash send them all back in time to the dinosaur age.