Emergency! S03E16 - Messin' Around

Chet, adopting a persona he calls "The Phantom Bomber," nails Johnny with a number of practical jokes, for which Johnny later gets his revenge. A child is stuck in a tree house (with the tree burning underneath) and is rescued by Johnny; the girl's widowed mother takes an interest in him, all the while, Dixie takes care of the mother, who herself also has slight burns. The girl then fields a visit from an elderly man and frequent visitor to Rampart known as "Old Bill." Dixie, Drs. Brackett, and Early think "Old Bill" is a hypochondriac until Roy and Johnny find him unconscious in his home with septic shock. Johnny and Roy help a moaning man after his wife gives him Dieffenbachia sap to shut him up, a gas station attendant with a perforated ulcer, a young boy who swallows ant poison and later dies–his mother thought he was just trying to "get attention"–and three men stuck after a bulldozer accident.