Teenage Mutant Turtles loyalists, hold on to your shells.

The bad guys of the mutant franchise were spotted on the sequel's set for the first time on Tuesday.

Shredder was back - albeit played by Brian Tee this time around - and he was joined by iconic criminal duo Bebop and Rocksteady in New York.

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Enter the Shredder: Brian Tee was seen on the New York set of Teenage Mutant Ninja Turtles 2 as bad guy Shredder for the first time on Wednesday

While fans will no doubt be very excited to see the twosome, who did not make the cut for the 2014 release, the baddies looked very different.

Namely they were not mutant zoo animals.

In the original 1980s cartoon series, Bebop - played this time by Gary Anthony Williams - and Rocksteady - portrayed by pro wrestler Sheamus - were a humanoid warthog and rhinoceros, respectively.

Double trouble: Bebop - played this time by Gary Anthony Williams - and Rocksteady - portrayed by pro wrestler Sheamus - also made their debut

Changing things up: In the original 1980s cartoon series they were a humanoid warthog and rhinoceros but their mutation may be part of this film's plot

No improvement: How the duo looked in their human form

However when they were initially introduced in the cartoon they were human too, so they may yet undergo mutations into the humanoid hog and rhino the fans love to hate.

For the day of filming, the pair was seen conversing in a cafe with Gary Anthony sporting Bebop's iconic purple mohawk.

The characters were meant to appear in the first film but were then written out with the intention of them bringing something new to the sequel.

Hair raising: For the day of filming, the pair was seen conversing in a cafe with Gary Anthony sporting Bebop's iconic purple mohawk

The two bad guys of course form part of the ultimate bad guy Shredder's Foot Clan.

The new Shredder was on set for the first time on Wednesday also.

Stepping as the head bad dude, Brain was dressed in full battle worthy leathers with the character's signature spiked arm guards - which appeared to have the razor sharp spikes retracted - along with metal shin and knee guards.

He was not wearing Shredder's scary helmet and face mask as that is no doubt the last piece of the costume to go on before filming.

Fighting fit: Brain was dressed in full battle worthy leathers with the character's signature spiked arm guards - which appeared to have the razor sharp spikes retracted - along with metal shin and knee guards

Just hours after it was announced she was joining the film, Brittany Ishibashi was also on set.

The 34-year-old actress will play Shredder's daughter Karai and was dressed in a female version of her on-screen father's look.

The form fitting body suit features leather breast as well as leather panels on her shoulders, arms and legs.

Bad girl: Just hours after it was announced she was joining the film, Brittany Ishibashi was also on set to play Shredder's daughter Karai

The formidable force of bad guys will be, of course, facing off against the Teenage Mutant Ninja Turtles and their reporter pal April, played by Megan Fox when the film hits theatres June 3, 2016.

Also returning is Will Farell as Vernon Fenwick, who gets a new love interest in supermodel Alessandra Ambrosio.

Other new cast members include Laura Linney, Stephen Amell and Tyler Perry as the evil humanoid fly scientist Baxter Stockman.