Stone-Age Hoppit
From Tardis Wiki, the free Doctor Who reference
When Monica, Buttons, and Cuthbert arrived at the Stone Age in the Doctor's TARDIS, they approached a cave, only to discover it was a Stone Age TV Studio with its own Cave-Age version of Hoppit. He chased them back to the TARDIS, causing them to return to the 20th century. (COMIC: TV Terrors)