Created by Lord Zedd from the large & unusual shell that Kim had found at the lake, Turbanshell is a mollusk monster. Turbanshell wields a staff with a large spiked shell on one end, projects energy beams from his face, and can project an energy twister from his staff. He also seems to grow giant on his own accord, rather than through Zedd's growth bomb. Turbanshell was able to seal itself up in its shell and hurl itself repeatedly, in a circle pattern, at the Thunder Megazord, knocking it over, and cause the Rangers to eject from it. Turbanshell takes a break and goes back to Zedd, who becomes furious with Turbanshell for leaving the battle while having the upper hand.
Turbanshell was then sent to fight Tommy, as he was able to absorb the last of his powers. Turbanshell causes Tommy to desperately fight back even without his powers. Goldar intervenes and tells Turbanshell that he will continue torturing Tommy while Turbanshell resumes his destruction of Angel Grove. Turbanshell is hesitant at first and wants to be the one to finish Tommy, but Goldar threatens him and reminds him of his status as an underling, letting him know that Lord Zedd has other plans for him. Turbanshell continues to attack Angel Grove after Goldar takes over his place.
In the meantime, Turbanshell's onslaught is broadcast on television and the Rangers feel helpless since they can do nothing to put a stop to him at that time. Tommy manages to escape from Goldar, returning to Angel Grove. Tommy then deceives Turbanshell by hiding in a cart of watermelons, which Turbanshell eats. Tommy attacks the monster from the inside with intense heat and then Zack grabs a nearby water hose, rapidly cooling Turbanshell's exterior, causing him to freeze. With the monster severely weakened, and Tommy clear, the Thunderzords are brought back, and the Rangers quickly defeat the monster with the Thunder Saber.
The Turbanshell costume was later recolored, caped, and deshelled with a stinger added onto it where it was seen in cameos in Fire in Your Tank and Heir to the Throne
Turbanshell comes from what is commonly referred to as "Zyu2" footage, and was not seen in the original Zyuranger. Ultrazord originally defeated Turbanshell.