the original cartoon is used in the opening credits
Episode of the cartoon heard on a TV.
A balloon of Underdog is seen during the Thanksgiving Day Parade scenes.
There's an Underdog toy on Barry Cohen's desk.
Referenced by Crow
Servo: "It's Underdog!"
Servo: "And the body of Chumley"
Mark is seen wearing an Underdog shirt.
Servo: "Crow looks like Underdog, from the Macy's parade."
Joel: "Thank you, Shoeshine. You're humble and skeletal."
One of the balloons seen in the Thanksgiving parade is Underdog.
Sergant Stimpy of the Klondike is a parody of Klondike Kat.
A character in the film says, "Have no fear," and Joel adds, "Underdog is here!"
"Have no fear." Crow: "Underdog is here!"
"Savior Faire is everywhere"
Underdog is mentioned by Hank Fielding on Weekend Update
Crow (imitating Simon Bar Sinister): "Simon says, shoot them!"
Monica mentions it.
Alluded to in title
Fran mentions the series by name.
barbershop quartette performs the theme song
Ross is asked who the voice of Underdog was during his grant review. Later he remembers it was Wally Cox.
title character is correct response in "TV Cartoon Pooches" category
Joel: "There's no need to fear. Underman is here!"
Rooster mention the show.
Underdog was mentioned.
Underdog shirt seen
George S. Irving's role as the narrator mentioned
Mentioned as a running gag between G and Sam.
Mentioned in dialogue
Del can be heard watching it in the motel room.
A clip of Underdog was shown.
Much like Blue Beetle, Underdog takes an energy pill to acquire his super strength.
Thunderdogg is a parody of Underdog.
everyone is amazed that Underdog can speak