Dover, N.H. unveiled a “TMNT” manhole cover with art by co-creator Kevin Eastman.

Eastman and co-creator Peter Laird are often associated with their Northampton, Mass.-based Mirage Studios.

The one-shot comic, published independently by Mirage Studios on Union Street, debuted in 1984.

Ninja Turtles Manhole

Kevin Eastman’s design for the commemorative manhole cover.The City of Dover, New Hampshire

The Teenage Mutant Ninja Turtles soon became a full comic series and ultimately an international multimedia franchise."

The tribute was crowdfunded by Dover resident James Lane, a city representative tells EW.

The unveiling was timed to coincide with the citywide celebration of Dover’s 400th anniversary.

Eastman continues to be occasionally involved in Turtles comics.