- "Cartman Gets an Anal Probe" - First Appearance, kidnapped Cartman and Ike; believed cows were smartest life forms on Earth.
- "City on the Edge of Forever (Flashbacks)" - Appeared in Stan's dream of the boys' incorrect memories.
- "The Red Badge of Gayness" - Seen on their home planet.
- "The Biggest Douche in the Universe" - With the other aliens who came for John Edward.
- "Cancelled" - Viewers of the alien network.
- Visitors appear in the credits - one is hiding behind a building, and there are a large group standing by the road later on.
- "Cartman Gets an Anal Probe on the "milk is yummy" picture.
- When the boys enter the cafeteria to get their food while talking to Chef, a dark colored visitor is on the leftmost tray of food.
- "Big Gay Al's Big Gay Boat Ride" - In the audience at the Football game, there are two visitors seated on the upper right wearing cow hats.
- "Pinkeye" - Three Visitors can be found in this episode
- At the morgue, a miniature Visitor is seen in a jar.
- A crashed UFO can be seen when Liane Cartman is decorating the house.
- Back at the morgue, on a calendar.
- On Chef's Belt buckle as he enters the Morgue.
- "Damien" - There are four aliens in this episode.
- In the whirlwind that occurs as Satan speaks.
- Cheering in the boxing match crowd near Stan's mom.
- Behind the mayor in the boxing match.
- In the very beginning, there are four drawings of visitors on the classroom board directly behind Wendy.
- "Tom's Rhinoplasty" - It is on their board in the classroom. When the kids are under their desks, the visitor on the bottom right blinks.
- "Cartman's Mom is a Dirty Slut" - Near the end of the episode after Ned says 'Could be', the camera zips pass the visitor that is behind Chief Running Water.
- As with season one, Visitors can be seen multiple times in the credits.
- "Terrance and Phillip in Not Without My Anus" - Sitting on the stands with Cow hats and in Tehran.
- With the Canadians.
- When Philip spots Terrence's Daughter, Sally, The alien is on the left, in the crowd near Sally.
- "Cartman's Mom is Still a Dirty Slut" - Standing among the crowd of Cartman's potential fathers in the hospital, behind Chief Running Water again. It doesn't seem to go away so it seems to have had an affair with Liane Cartman.
- "Chickenlover" - An alien is brushing a horse at the petting zoo.
- "Conjoined Fetus Lady" - In the middle of the dodgeball game in Denver, Chef talks to Pip, and the visitor is playing tennis in a picture behind Chef.
- "City on the Edge of Forever (Flashbacks)" - Before the children fall into a big bucket of ice cream, the visitor is cramped in between Kyle and Cartman while falling.
- "Summer Sucks" - Standing in the pool where Cartman is getting his swimming lessons.
- "Chef's Chocolate Salty Balls" - Three Visitors can be found in this episode:
- Rushing out of the theater with the others at the end of of "Me and Mr. Hankey".
- At the "Bijou" on the 2nd row from the back, behind the man with the cowboy hat.
- When Stan and Wendy go in and see, 'A Bunch of Gay Cowboys Eating Pudding', the visitor is in the same row but it is one seat more to the right.
- "Roger Ebert Should Lay off the Fatty Foods" - In the final scene when Cartman speaks about being on TV and a hero, a Visitor's silhouette is on a computer console, with colored lights making up the eyes.
- "Cow Days" - Two Visitors appear in this episode:
- Peeking out of the freaks tent when Kyle tells Kenny to give up his food stamps.
- Driving the limo at the end of the episode.
- "Spookyfish" - There are two Visitors in this episode:
- Before Cartman meets his evil counterpart, the woman on the sign has a Visitor's head.
- When Stan's dog is digging up the dead bodies, you can see a (green) Visitor behind a tree.
- "Merry Christmas Charlie Manson!" - While racing from the mall, Manson's tattoo changes from a smiley face to a Visitor.
- "Gnomes" - Appears in the final scene, standing in the back row of the group shot outside Harbucks Coffee House while everyone is laughing at Tweek.
- Visitors appear in this season's credits at the start of each episode.
- "Spontaneous Combustion" - The outline of the face of a Visitor can be seen on the moon, when Cartman dreams that Chef rescues him from the cross.
- "Cat Orgy" – Behind Ripley when Cartman is watching "Aliens".
- "The Red Badge of Gayness" - When Cartman screams when Kyle rips off Cartman's beard, it shows the home planet of the visitors with a crowd of visitors on it.
- As with previous seasons, Visitors are present in the opening credits.
- "Chef Goes Nanners" - When Chef discovered Jimbo and Ned wearing KKK robes, for one second, a Visitor is seen standing in the shadows next to a tree, in the same color as the tree.
- "Something You Can Do with Your Finger" – On one of the pillars that hold up the bridge in a picture above Stan’s parents bed, before they go to the mall.
- "Do the Handicapped Go to Hell?" - There are two Visitor sightings in this episode.
- On both sides of the confessional when Cartman is thrown out. Look at the top of the confessional.
- Beyond a tree when Cartman is baptizing Kyle, Timmy, and Ike.
- "Probably" - On top of Cartman's Church.
- "It Hits the Fan" – In Merlin’s lair, opposite the entrance.
- "Super Best Friends" - Two Visitors appear in this episode:
- Upside down in Jesus' reflection when he lines up with the others.
- Part of one appears at the David Blaine show in Denver in the overhead screen.
- "Proper Condom Use" - Two ghostly visitors can be seen watching Butters putting on a condom in a tree.
- "Towelie"- On one of the towel clones behind the blonde haired leader of the group trying to take Tynacorp down when he is telling the boys how they have been double crossed.
- "Jared Has Aides" - Five visitors can be seen in this episode:
- Chef uses a Visitor shaped spoon when he leads the boys into the kitchen.
- When Jared follows his girlfriend out, if you look very closely to his left is a Visitor on the wall.
- When Jimbo announces that AIDS is funny, a Visitor is seen over Mayor McDaniels' head.
- When Tuong Lu Kim pays the boys for their work, one is seen behind the post office.
- When Jared walks outside in the rain after being fired, there is a visitor made of fire in the barrel he walks by (It is only seen for a very short time).
- "Asspen" Two Visitors appear in this episode:
- When Cartman joins in for breakfast, a visitor replaces Kyle's chair support.
- One looks at Thumper teaching, then skis off.
- "Fun with Veal" - Next to Butters when Cartman starts the negotiation.
- "Professor Chaos" - In front of the "Yeti Log Ride".
- "Red Hot Catholic Love" - Atop the obelisk at "Vatican Square".
- "Free Hat"- When they showed the re-release of the first episode of south park.
- "The Biggest Douche in the Universe" - A ghostly visitor in between Chef and Liane at John Edward's show.
- When the alien ship lands to get John Edward as a member of Biggest Douche in the Universe Committee.
- "My Future Self n' Me" - Under the window in Butters' living room.
- "Red Sleigh Down" - In the crowd in the second scene where the mayor announces the Christmas lights will be lit shortly. He is in the crowd cheering, slightly above Dr. Mephesto to the right of the screen.
- There is a visitor standing by a picture of Saddam in the streets of Iraq (This one is very very small because it shows a large area of Iraq)
- "I'm a Little Bit Country" - In the closing scenes of the episode, with the other guests.
- "Red Man's Greed" - When S.A.R.S. breaks out in South Park, during the news report in front of the Post Office.
- "You Got F'd in the A" - In the crowd after the O.C. crew is killed
- "Goobacks" - Atop a tall building in Little Future.
- "Bloody Mary" - On the right side of the screen, mixed with the car background, as Stan is talking with his father. This Visitor is seen only in one part of the scene change, after Randy finds out that the Virgin Mary statue is bleeding.
- "A Million Little Fibers" - Next to an ambulance, while Gerardo is reporting on the standoff between Mingey and the police.
- "Mystery of the Urinal Deuce" - In the ambulance, when the SWAT team invades the house of the 911truth.org website creator.
- "With Apologies to Jesse Jackson" - When Randy Marsh gets chased by the Hillbilly Brigade, the one in the red vest has a Visitor on his belt.
- "Cartman Sucks" - When Cartman shows the class the slide of Butters and himself, you can see the alien's eyes on his forehead.
- "More Crap" - On the door handles to Bono's front door.
- "Tonsil Trouble" - In the audience at the end of the episode.
- "Britney's New Look" - A silhouette of a Visitor dances on a video wall at the 2007 VMA's.
- "Major Boobage" - Painted on the arch Kenny sees when he spots the woman being tortured.
- "Canada on Strike" -
- In one scene in Canada, one rectangular building's windows shape the visitor's head.
- Eye-less alien peering past a black Canadian.
- "Eek, A Penis!" - Green visitor is against a tree behind Kenny's left shoulder.
- "Over Logging" - A well dressed Visitor can be seen observing Randy while he's talking to the owner of the "Internet Porn Simulator".
- "Super Fun Time" - Etched into the wooden fence surrounding the "Pioneer Village", at the end of the episode.
- When the criminals enter Pioneer Village, Stan, Wendy, Kyle, and Jimmy are in the General Store. When the store owner shuts the door, you can see a faded visitor from out the window.
- "Dead Celebrities" - After they announce the winner at the end. He is sitting with the audience with a wig and make-up on.
- "Butters' Bottom Bitch" There are two visitors in this episode.
- When it shows Butters with his tie, and the other playground kids about to go behind the school to kiss the girl. He is really small, in the very far background, behind the jungle gym.
- When Butters gives a "sunshine sticker" to Charise, a visitor can be seen on the upper right corner of Butters' pimp schedule.
- "W.T.F." - There are five Visitors in this episode:
- At the pay phone just outside the Pepsi Center entrance.
- Rushing out the front entrance near the Visitor above.
- On a woman's shirt.
- Behind a woman, before she walks by and blocks him out of view.
- A girl is carrying a Visitor doll in her hand.
- "Whale Whores" - On the crab fishing boat when it first appears, among the crowd. Only eyes are visible.
- "The F Word" - Hidden against the wall outside "Ronny's Diner".
- "Dances with Smurfs" - When Cartman is sitting down, in the background in the door.
- "Pee" - Holding a banana and wearing sunglasses at the end of the episode, in front of an ambulance.
- "You're Getting Old" - At the bowling alley watching Randy making his own Tween Wave on the stage.
- On Cartman's left in "Mountain Town (Reprise)".
- On the money Sheila is handing over to Conan.
- Black alien in the movie theater watching Asses of Fire.
- Cartman has a photo of an alien in a frame.
- On one of the dollar bills that Stan gets from his mom. It is quickly replaced with a human head.
- A picture of a Visitor appears on the "Have you seen me?" poster in the cafeteria in the episodes:
- "The Mexican Staring Frog of Southern Sri Lanka"
- "Chef Aid"
- "The Succubus"
- "Sexual Harassment Panda"
- "The Tooth Fairy Tats 2000"
- "Elementary School Musical"
- "Chef Goes Nanners"
- "Fat Camp"
- "Proper Condom Use"
- "The List"
- "Crème Fraiche"
- A crayon drawing of a Visitor appears on the "our pets" notice board in classroom scenes in the episodes:
- "World Wide Recorder Concert"
- "Hooked on Monkey Fonics"
- "Timmy 2000"
- "Cherokee Hair Tampons"
- "Chef Goes Nanners"
- "Mr. Hankey's Christmas Classics"
- "Fourth Grade"
- In the episode "Pinewood Derby" when the crowd awaits the aliens, there are 3 signs showing pictures of Visitors.
They are weak to electricity.They only can say one word, "moo", in various fashion to convey meanings. Manyy of them have died.
Refractor Shield - The alien put three shields on itself.
Space Medicine - Heals the alien.