|Episode no.||Season 3
|Directed by||Tom Cherones|
|Written by||Larry David|
|Original air date||October 2, 1991|
"The Pen" is the 20th episode of Seinfeld, the third episode of the third season which first aired on October 2, 1991.
This is the only episode in which George does not appear, and one of only two episodes in which Kramer does not appear. This is also the first appearance of Morty's rival Jack Klompus and of Uncle Leo's wife (and Jerry's aunt) Stella.
Jerry and Elaine go to Florida to visit Jerry's parents for the weekend and plan on going scuba diving (which Helen doesn't see the point in doing). Morty Seinfeld, Jerry's father, is also being honored at a ceremony the next night. Jack Klompus and his wife Doris come over to write Morty a check for a previous night's dinner and Jerry notices Jack's pen. When Jerry asks Jack about it, Jack tells him that it can write upside down and that astronauts use it in space. Jack offers an interested Jerry the pen. Jerry refuses his offer several times, but Jack persists and Jerry finally gives in. Helen Seinfeld, Jerry's mother, asks why he took the pen and says he should give it back because Doris will tell everyone in the condo that Jerry made Jack give it to him.
That night, Elaine sleeps on a sofa bed with a bar that sticks up through the mattress and hurts her back, making her extremely uncomfortable, while not being helped by the fact that the air conditioning is turned off, since Jerry's parents are "nuts about temperature". Jerry tries to comfort her by saying they only have two more days left before they go back to New York. The next morning, Elaine's back is so sore that she cannot go scuba diving with Jerry, so he goes without her. Morty suggests she take muscle relaxants to ease the pain. Just as Helen predicted, rumors begin to spread around the community that Jerry wanted Jack to give him the pen. When Jerry returns, he has black eyes because the capillaries around his eyes burst when he went underwater and the pressure was too tight on his mask.
Jack comes over again and Jerry returns the pen. Morty berates Jack for "taking Jerry's pen". Elaine decides she wants to take the muscle relaxants, but takes a slight overdose and acts goofily at the ceremony. Jerry has to wear sunglasses because of his black eyes. Jack is the MC and turns the dinner into a "roast", making cracks about Morty at the podium. Morty starts arguing with Jack again about taking back the pen and they start fighting, breaking Jack's dental plate in the process, prompting a bitter Jack to sue Morty. The next day, a chiropractor looks at Elaine's back and tells her she should not go anywhere for at least five days, extending both her and Jerry's stay even longer, much to their discomfort.