Amoebarugin appeared in 1990 TV series called Chikyuu Sentai Fiveman. Amoebarugin (アメーバルギン Amēbarugin) is the amoeba-theme Silver Imperial Army Monster of the Silver Imperial Army Zone. Amoebarugin is sent to deal with Ken Hoshikawa as he trains three boys who bring him in to help them train in how to master the vaulting horse jump. When FiveBlue and the other Fiveman try to attack him, he continues to revive due to his special ability to revive from anything. However, during one of the revivals, the trio of boys training with Ken end up witnessing the means of revival and bolt to tell their teacher about him, finally mastering the means to vault in the process by leaping over a group of Batzlers. When Ken finds out, he decides to defeat the monster as himself instead of FiveBlue in order to prove to the boys that they could do anything they could put their mind to without revealing who he is or the advantages he has. Throwing a powerful punch at the weak point, the untransformed Ken destroys the weak point, making Amoebarugin collapse without repair. After Doldora summons Gorlin #17 to take in the genetic material to make it giant, Fiveman use Star Five against him, destroying him with the Star Hang Beam and Star Gun.
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His main ability is the usage of seaweed-like tendrils to attack and wrap its opponents, but his key ability is an unstoppable immortality that allows for him to continue to revive over and over as long as no one attacks his weak point in the middle of his chest.