TIL: Upon TMNT's first arrival in the United Kingdom and Ireland the name was changed to "Teenage Mutant Hero Turtles" (TMHT), since local censorship policies deemed the word ninja to have excessively violent connotations.

Censorship sucks, but I doubt ninja was the reason it was in Ireland, I would assume it was British broadcast and Ireland kept up the name for recognition purposes when they eventually broadcast it.

The above is complete conjecture

"Teenage Mutants?"

Just fine, Governor.

It's a sad state going from the massive global empire they created to censoring the word "ninja" because it has "excessively violent connotations."

It was called Ninja. I watched it on BBC as hero and then switched to RTE for Ninja...