Hoppy

From Tardis Wiki, the free Doctor Who reference
You may be looking for Mister Hoppy.

Hoppy was a fictional character who replaced Panda in a TV show about Iris Wildthyme from the 42nd century.

He was an Australian kangaroo with a cocked hat. There was a plushy based off his likeness, which had a voice synthesiser. (AUDIO: The Iris Wildthyme Appreciation Society)