The Sure Thing Robbie's friend has a grandfather that trains horses, but on the day of the big race when the thoroughbred racehorse loses her mascot, a rabbit, she loses her speed. But once she hears Robbie serenade on the guitar, the mascot problem is solved. Details Casts Title The Sure Thing Genres Comedy Family Release Date 1965-03-25 Episode Runtime 00 Hours 30 Minutes Season Number 5 Episode Number 28 Production Companies MCA Television, Don Fedderson Productions, Gregg-Don Inc. Fred MacMurray Steve Douglas Tim Considine Mike Douglas Don Grady Robbie Douglas Stanley Livingston Chip Douglas William Frawley Bub O'Casey William Demarest Charley O'Casey