|“||Can we talk? Ahhhh! Nugh! Tha! Thuuagh!!!!||„|
|~ Hisser's final words before his destruction.|
Hisser is a cobra/pill bug-like Toxic Mutant who is the first of his kind to battle the Mega Rangers alongside Bigs and Bluefur at the debut of the Toxic Mutants, he is the primary villain of the episode "Robo Knight (episode)".
He was voiced by Estevez Gillespie.
Hisser is a Toxic Mutant that accompanies Bluefur and Bigs to meet the Mega Rangers. He first appears in next to a building like construct and encounters the Red, Yellow, Blue, Pink and Black Rangers in battle after surfacing from underground, and after Bigs and Blufur appears and explains the disasters of the toxin because of the Humans poor respect, Blufur summons Hisser to attack the Rangers, he had the upper hand at first, but the Blue Ranger was able to fight back while the Red, Yellow, Black and Pink Rangers goes after Blufur and Bigs, the Blue Ranger does battle with Hisser, but he was out match as he has the ability to burrow underground and spray toxic slime, and does so on all five of the Mega Rangers after they been overpowered, sapping away their energy, despite this, as well as being told of the plan to make more toxin, the Rangers refused to give up, and continue fighting, but they will overwhelmed by both the slime that saps their power and Hisser's shear strength, thing got even worse after gets ambushed by the Toxin Fireball launched the combined assault by Bluefur and Bigs.
Luckily, the newly introduced Robo Knight comes to the aid of the depowered Rangers, which allowed them to break free of the slime, Hisser does battle with Robo Knight, but he was no match and he is destroyed by his Vulcan Cannon. Vrak sends his Zombats and makes Hisser grow, he then transforms into a limo-like form and starts attack the Rangers, but Robo Knight transforms into his Lion Zord and does battle with Hisser, he gains the upper hand with his shear power and then transforms into the Lion Mechazord, Hisser tries to fight back, but he was no match and after being forced back to his original form, Hisser is destroyed again by the Lion Mechazord's Knight Power Charge Victory Strike.
He later returned when he was summoned by Distractor, at first as an illusion and later as a real monster when Vrak powered up Distractor with the Wild Sword. Like the other phantoms, he was destroyed once again by the Ranger's Ultra Power Dynamic Strike.