Mork & Mindy (1978)

S4E4 Three the Hard Way

Title: Three the Hard Way Plot: Dr. Exidor discovers that Mork is expecting. To everyone's surprise, Mork lays an egg from his navel. Mindy struggles to come to terms with the fact that their offspring resides within the egg. As time passes, the egg develops and eventually hatches into a fully grown, elderly man, much to Mork and Mindy's astonishment.