Ultraman Leo
- Red Gillas (Episode 1 and 2)
- Black Gillas (Episode 1 and 2)
- Alien Magma (Episode 1 and 2)
- Alien Tsuruk (Small and large forms; Episode 3 and 4)
- Kanedoras (Episode 5)
- Alien Karly (Small and large forms; Episode 6)
- Kendoros (Episode 7)
- Vekira (Episode 8)
- Guiro (Small and large forms; Episode 9)
- Ron (Leo's Former Pet; Episode 10)
- Alien Kettle (Small and large forms; Episode 11)
- Bango (Episode 12)
- Alien Vibe (Small and large forms; Episode 13)
- Antales (Episode 14)
- Alien Flip (Small and large forms; Episode 15)
- Alien Atler (Episode 16)
- Alien Wolf (Small and large forms; Episode 17)
- Bat Girl (Episode 18)
- Batton (Episode 18)
- Alien Boze (Small and large forms; Episode 19)
- Bock (Episode 20)
- Dogyuh (Episode 20)
- Alien Alpha "Goddess Of Nike" (Episode 21)
- Alien Northsatan (Small and large forms; Episode 21)
- Litre (Episode 22)
- Garon (Episode 22)
- Alien Coro (Episode 23)
- Renbolar (Episode 23)
- Carolyn (Episode 24)
- Professor Dodole (Episode 24)
- Gamelot (Episode 24)
- Alien Clean (Episode 25)
- Satan Beetle (Episode 25)
- Alien Pressure (Episode 26)
- Oni-on (Episode 27)
- Archer Boy (Episode 27)
- Alien Paradai (Episode 28)
- King Paradai (Episode 28)
- Uriy (Episode 29)
- Uringa (Episode 29)
- Alien Magma II (Episode 30)
- Rolan (Episode 30)
- Alien Virmin (Episode 31)
- White Flowers Fairy (Episode 31)
- Princess Kaguya (Episode 32)
- Kiraa (Episode 32)
- Alien Akumania (Stage 1 and 2; Episode 33)
- Ashuran (Both sides; Episode 34)
- Sevenger (Capsule Monster; Episode 34)
- Taishoh (Episode 35)
- Alien Atlanta (Episode 36)
- Alien Mazaras (Episode 37)
- Specter (Episode 37)
- Fake Astra (Episode 38 and 39)
- Alien Balbalu (Episode 39)
- Commander Black (Episodes 40-51)
- Silver Bloome (Saucer, small, and large forms; Episode 40)
- Black Dome (Small and large forms; Episode 41)
- Absorba (Small and large forms; Episode 42)
- Demos (Small and large forms; Episode 43)
- Black Garon (Small and large forms; Episode 44)
- Blizzard (Both sides; Episode 45)
- Hangler (Episode 46)
- Black Terrina (Episode 47)
- Satan Mora (Episode 48)
- Nova (Episode 49)
- Alien Bunyo (Small and large forms; Episode 50)
- Black End (Episode 51)
Read more about this topic: Ultra Monsters