The episode begins with an elderly couple, Eustace and Muriel Bagge, who live on a farm and own a dog named Courage. The family are spending an idyllic morning together, when Courage becomes frightened by a small mouse; this prompts Eustace to scare him further by use of a voodoo mask. Courage moves outside to the porch, and watches as a UFO descends from the skies. An extraterrestrial species of fowl emerges from this UFO.
Courage runs back inside the farmhouse to alert his owners of the danger; however, when they follow Courage into the yard, the saucer has disappeared, along with the alien chicken. Eustace proceeds to scare Courage once more, causing Muriel to strike him with a rolling pin as punishment. Courage makes his way out to the hen house, where he discovers the Space Chicken dispatching the hens Eustace and Muriel tend to.
Courage quickly runs back to the house to alert Eustace and Muriel to the presence of the alien fowl, but when Muriel returns with Courage to the hen house, the remains of the hens have mysteriously disappeared, with only the Space Chicken in their place. While Courage attempts to deduce what happened to the other hens, Muriel unknowingly takes some of the Space Chicken's eggs. Courage is able to knock two of them onto the ground; this angers the Space Chicken, who proceeds to lock Courage in the hen house upon Muriel's departure.
While Courage is making his escape from the hen house, Muriel fries the alien eggs and serves them to herself and Eustace. Courage succeeds in escaping and begins searching for a buried object. At the house, Eustace eats the eggs and begins to sweat profusely, before his eyes seemingly change color. Courage recovers his old slingshot and rushes back to the house, while Eustace begins transforming into an alien fowl himself, laughing insanely all the while. Muriel realizes the eggs are the cause for Eustace's ailment and avoids eating them. Courage arrives back at the farmhouse and ambushes the alien, momentarily knocking him unconscious with the sling-shot. The bird quickly recuperates and a fight ensues.
Courage and the Space Chicken attempt to negotiate for Muriel's safety through numerous games, such as rock-paper-scissors and fencing, while Eustace slowly completes his transformation. A mindless Eustace slowly advances upon Muriel, while Courage succeeds in the games against the alien. However, the Space Chicken reveals a large beam gun and attempts to assassinate Courage with it; Courage is able to dodge the beam, leading to it bouncing back onto the chicken, seemingly destroying him. Courage then shoots the alien Eustace with the same gun, causing him to disintegrate into a pile of ash.
While Courage and Muriel are lounging peacefully in a rocking chair, a mouse is seen ingesting some of Eustace's ashes, before its eyes change color. Courage screams in terror, ending the episode on a cliffhanger. Before the iris out, Courage turns to us and says one thing: "This shouldn't happen to a dog!"
- John R. Dilworth (Silly-Pop Billboard)
- This episode debuted almost 4 years before Courage the Cowardly Dog was made into a full series.
- First appearance of Courage, Muriel, Eustace, and the Space Chicken.
- Muriel and Eustace do not speak in this episode, save for Eustace's insane laughter as he turns into an alien chicken.
- While Eustace is reading a newspaper, a caption can be seen on the press that says "UFO Sighted"
- There are various images of real life people shown as framed pictures in the Bagges' house during the episode.
- John R. Dilworth makes a cameo in this episode, appearing on a billboard with the text "Drink Silly Pop!" as he gets zapped by the Space Chicken's laser beam.
- At the very end of the short, Courage opens the iris and says "This shouldn't happen to a dog!" before the iris closes on his nose and snaps on it while he says "Ouch!". This a reference to the ending of Bob Clampett's 1944 Bugs Bunny cartoon Hare Ribbin'.
- During the credits sequence, a different version of the Stretch Films logo can be seen.
- This short was nominated for an Academy Award for Best Animated Short Film. It lost to the Wallace and Gromit short A Close Shave.
- This pilot premiered on Cartoon Network's "What A Cartoon" show.
- After Courage was made into a full series, this short was included as a bonus on the VHS release of Scooby-Doo and the Witch's Ghost, being shown after the credits of the main feature. For this re-release, a new title card was created, which can be found in the Gallery below.