Ultraseven X
- Galkimes (Episode 1)
- Leader of the Alien Group (Episode 1)
- Lady Executive of the Alien Group (Episode 1)
- UFO / Alien Abductors (Episode 2)
- 'Alien Attacker' (Episode 2)
- Alien Markind (AKA Tamaru, Episode 3)
- Peginera (Episode 4)
- Alien Vo-Da (Episode 5)
- Alien Chamda (AKA Slender Man, Episode 5)
- The Soul of Light (Episode 6)
- Alien Vairo (Nataru and multiple others, Episode 7)
- Vadoryudo (Episode 7)
- Hupnath (Episode 8)
- Jyuujin (Episode 9)
- Mecha-Grakyess (Episode 12)
- Grakyess (Episode 12, though their human guise is seen throughout the series)
Read more about this topic: Ultra Monsters