Alien Guts

Alien Guts is an alien that has appeared as an antagonist in the Ultraman franchise, first appearing in Ultraseven.

Ultraseven
Alien Guts first appeared in episodes 39 and 40, where two plotted to conquer Earth by defeating Ultraseven and causing humanity to lose hope. They imprisoned Ultraseven within the Crystal Cross, but Ultraseven regained his energy thanks to the Ultra Garrison and freed himself from the crystal using the Break Beam. Alien Guts was later destroyed by Ultraseven with his Eye Slugger.

Ultraman Mebius & the Ultra Brothers
Alien Guts appeared as part of an alliance with Alien Temperor, Alien Zarab and Alien Nackle to release Yapool and his choju U-Killersaurus so they could conquer Earth.

After Temperor and Zarab died completing their parts, Guts and Nackle proceeded to Phase 3 of their plan. Guts trapped Mebius within a Crystal Crucifix, prompting the Ultra Brothers to travel to Earth to help. Though the Ultra Brothers managed to free Mebius, they themselves were soon trapped. Guts and Nackle then attempted to use the Light Energy of the Ultras to break the seal of U-Killersaurus. However, Mebius managed to regain his strength and attacked the two aliens, eventually killing Guts with his Mebium Shot.

Ultra Galaxy Mega Monster Battle
Alien Guts had his Gomess challenge Rei's monsters. While Gomess was initially winning, the tide soon shifted when Gomora destroyed Gomess with his Super Oscillatory Wave, prompting Guts to retreat.

Alien Guts later reappeared to challenge Rei with Cherubim, but was later killed when Cherubim tripped on its tail and fell on him.

Mega Monster Battle: Ultra Galaxy Legends The Movie
Alien Guts appears as a member of the Belial Army. He attacked Ultraseven alongside King Joe Black, Fire Golza, Eleking, Verokron, Doragory, King Pandon, Banpira, Alien Metron and Gan Q. He was later killed by Ultraman Zero with his Zero Slugger Attack along with Alien Valky, Fire Golza, King Joe Black, Zetton and Tyrant.