The excited chatter of littlies heralded the start of a new term at Appleton Kindergarten in Dannevirke on Tuesday.
However, staff said they got a "heck of a shock" when through the door came Dennis.
"It was around lunchtime and he just strolled in as large as life and sat down, waiting for mat time," said teacher Viv Murphy. "We just couldn't believe it."
Dennis isn't just any ordinary kindergarten pupil, in fact he's known as something of a hard-case houdini - an escape artist turtle.
Dennis did a disappearing act three-and-a-half weeks ago, sparking a huge search by the children, staff and neighbouring homeowners.