From Robin Williams' debut as Mork to the infamous 'jump the shark' moment, here are five essential episodes of Happy Days.

The Season 3 Happy Days episode, titled “A Date With Fonzie,” aired on Nov. 11, 1975, with guest stars Penny Marshall and Cindy Williams as Laverne and Shirley, two “fast” friends of Fonzie’s (Henry ...

These days, it’s common parlance for TV fans to talk about a show “jumping the shark” when it starts declining in quality, usually due to some unexpected plot point or storyline. The origins of the ...