Bob Sacamano
Seinfeld's Kramer often referred to his friend Bob Sacamano, a colorful man about town who variously worked at a condom factory, sold fake Russian fur hats, got Kramer "off sugar," and suffered a bout of rabies.  Who could have played such a protean creation?  We would have liked to have seen Bruce Campbell give it a shot.

Jenny Piccolo
On Happy Days, "Italian" seemed to function as a synonym for "debauched," with Arthur "Fonzie" Fonzarelli and Charles "Chachi" Arcola cutting a sybaritic swath through Milwaukee's nubile teenaged girl population. Their distaff counterpart was the never-seen Jenny Piccolo, Joanie Cunningham's best friend and a bad-influence nightmare for Mr. and Mrs. C. Cathy Silvers joined the cast as Piccolo in the 1980 season, but the naughty suggestiveness of her off-screen adventures was lost. Ah well, there were always those crazy Tuscadero sisters to stir things up.

Mrs. Columbo
Lt. Columbo made frequent references to his wife when questioning suspects in his disarmingly digressive, ramshackle manner, but it was hard to imagine this shabby mess of a man was in any way domesticated. What wife would allow her husband to leave the house in that awful raincoat every day? Kate Mulgrew played the title role in Mrs. Columbo, a spin-off attempting to establish the Lt.'s spouse as a gifted sleuth in her own right, but the premise proved untenable. Network brass scuttled the Columbo connection and changed the character's name, but the show failed anyway.

Lars Lindstrom
The Mary Tyler Moore Show's insufferable, pretentious Phyllis Lindstrom was wont to drone on about the many positive attributes of her dermatologist husband, Lars, to the utter disinterest of her neighbors Mary and Rhoda. Strangely, Lars was never seen, though the housemates shared relatively close quarters. Perhaps unable to cast such a paragon of Midwestern manliness, the writers killed off Lars when Phyllis was given her own spin-off sitcom.

George Glass
The Brady Bunch's poor, neglected Jan concocted this imaginary boyfriend when a boy she liked snubbed her in favor of her older sister Marcia. For a girl whose defining characteristic was "pathetic," the George Glass incident is classic Jan.