The Radio is a character from Thru the Mirror who lives inside Louis' house in Bog Easy in Cartoon Wasteland He gives you news from around the area. Unlike the Telephone, he plays no important part in the game. In Jim the Puzzled's third and final riddle, the Radio is the answer; talk to the Radio after getting the riddle quest and he will tell that he's the answer.
The Radio reappears in Epic Mickey 2: The Power of Two, but this time in Mickey's Cartoon World house as an inanimate object. He later reappears in the fake Mickey's House and can be thinned by Thinner.