A space monster hailing from the Crab Nebula. Bemstar inhales gas energy sources like nitrogen, helium, and hydrogen through the mouth in its abdomen. Bemstar’s main attack is a beam it fires from his horn.

Bemstar inhales the MAT Station into its abdomen and then flies to Earth. Unaffected by the attacks by MAT Arrows 1 and 2, Bemstar shoots down MAT Arrow 1 with its beam attack and disappears.
It next appears in the sky above a gas plant, using the mouth in its abdomen to inhale the gas from a tanker. MAT arrives to fight it again, but it disappears again after shooting down MAT Arrow 2 this time.

Finally, Bemstar appears to attack a gas storage tank and is attacked by another MAT Arrow 2. Ultraman Jack appears but it overpowers Jack, even absorbing Jack’s Spacium Beam. Ultraman Jack leaves Earth to recharge his energy, where he receives the Ultra Bracelet from Ultraseven. Jack then returns and slices Bemstar into pieces using the Ultra Spark.