Donatello's carapace (IDW)

In the IDW continuity, since the events of the Vengeance story arc, has had an artificial prosthetic carapace to replace his original organic one, which  violently smashed into pieces with his hammer Juniper in the Attack on Technodrome arc. For a time, Donatello had been effectively mortally-wounded, and his brain temporarily hooked up to remotely control as his robotic avatar. To restore Donatello's broken body, Professor surgically operated on Donatello to bond the prosthetic shell he constructed with the rest of the 's body using some healing  provided by. The new carapace looks indistinguishable from the old one, except that it vibrates to impacts like a, and, as shown later in the Chasing Phantoms arc, is also bullet-proof, though bullets can still dent its finish.