Just a few episodes into Season 2 of NBC’s hit medical drama Emergency!, fans were stunned when it looked like the show might kill off two of its most popular characters: Dr. Kelly Brackett, played by Wagon Train alum Robert Fuller, and paramedic Johnny Gage, portrayed by handsome young newcomer Randolph Mantooth.

Debuting in January 1972, Emergency! had the challenge of competing directly with CBS’s megahit All in the Family. But thanks to its gripping, realistic (and emergency-filled!) storylines and promotion of America’s then-new EMT program, the Jack Webb–produced series quickly carved out a loyal audience.