Jack's Bad Boy is the twentieth episode of Season 4 of Three's Company and the 73rd overall episode of the series. Written by Mark Tuttle and directed by Dave Powers, it first aired 12 February 1980 on ABC.
Summary[]
The trio arrive home after work to find a twelve-year-old boy there. He said he was looking for his friend's house and, since the door was unlocked, he came in. The girls melt for him but when Jack discovers the boy is hiding one of his track trophies in his jacket. Jack believes he's nothing but a con artist, but the girls defend him. Even Ralph warms up to the kid, but when the kid gives Jack a hundred dollars to cover the rest of the rent, Jack thinks he stole it, and they try to sneak it back into Furley's.
Ralph adds up his money and has one hundred dollars more than he thought he had. The kid's chauffeur arrives and explains that the kid called for his allowance and now has to go home. The kid runs away a lot because he has everything and gets bored. He won't let the trio pay the money back and Jack agrees to give him the trophy he wanted, but he had already taken it again.