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Klaus was once an East German Olympic ski-jumper until his brainwaves were switched with that of a goldfish in the 1986 Winter Olympics by the CIA to prevent him from winning the gold medal. Klaus' human body with the goldfish brain headed for a nearby stream, and was later found frozen and allowed to decay by the CIA in "Da Flippity Flop".

Klaus took up residency with the Smith family, where the CIA ordered Stan to have him pose as their pet, a fact Klaus has still apparently not come to terms with. If something is done to him unexpectedly he gets very annoyed and swears revenge.

A recurring joke of the series is that Klaus' dark behavior, is due to him being German. In "Deacon Stan, Jesus Man", when he tricks Roger into eating Francine's potato salad, Roger is horrified asking Klaus why, to which Klaus responds "I'm German, it's what we do." Klaus will often drag out the revenge until he has forgotten about it such as in "Surro-Gate", but he hates to be interrupted during his 'snooze'.

Fish Body

Klaus' mind has apparently enhanced the physiology of his goldfish body in addition to the ability to talk. Klaus is apparently able to breathe just fine as long as part of his body is submerged in water, which is often shown when he drags himself along the floor in a shallow water dish. He may actually have the ability to survive in almost any type of liquid, since he once hid in a thermos filled with coffee in "Francine's Flashback", was frozen in his fishbowl when Karl Rove passed by in "Deacon Stan, Jesus Man", was congealed in jello when dared byHayley in "Frannie 911", survived being put in a freezer by Stan, in "Brains, Brains and Automobiles" by filling his bowl with vodka, and was put in a washing machine by Steve in "Roger Codger" and by Roger in "Great Space Roaster". Ordinary goldfish will immediately die if placed in any liquid other than water, or superheated water such as that found in a washing machine. One possible reason for this endurance was that he was previously a human. However, in "Hurricane!" he claims that salt water "burns" him when attempting to swim in it.

He also claims to have had his brain inhabit two sharks and a monkey, but this cannot be confirmed as true, as Klaus seemed to be sarcastic, and in a tone of voice that is ordering his grandson to be quiet and go to bed. Klaus is also a fan of the TV show Scrubs. Klaus has shown the Smith family his musical talent by playing Hava Nagila on champagne flutes.

Klaus's time as a fish also seems to have driven him partially if not completely insane, as he is prone to bouts of maniacal laughter. His frequent delusions are not a good sign either. Klaus is also paranoid of China thinking they're going to take over the world.

Roger and Steve once agreed with one another that Klaus was a psychopath when they thought he poisoned Roger's chocolates as revenge for a prank and looked over at Klaus who watching them from his bowl singing to himself with an evil glint in his eye such as in "Surro-Gate". Klaus also encourages Francine to kill herself in "National Treasure 4: Baby Franny: She's Doing Well: The Hole Story".

Other Bodies

In "Finances With Wolves", Klaus managed to temporarily become human when he switched his goldfish body for that of a black man's (the front man for an Earth, Wind and Fire cover group who tried to rip off the CIA at their summer mixer), and almost ran off with Francine, but the body was mortally damaged in the aftermath of an explosion at the mall. Deciding to spare his life, but also to make sure he never try to seduce Francine again, Stan transferred Klaus's brainwaves into another goldfish's body; Klaus had flushed the previous fish's lifeless body down the toilet. This episode also gave an indication of his personality, while Stan dove to save Francine from the blast, Klaus was more concerned in saving his new human body, which showed that Stan cared more about Francine than Klaus. However after this, Klaus's obsession with Francine has largely tapered off, which could mean that Klaus is indeed grateful to Stan for saving his life.

In "Of Ice and Men" he is shown in the year 2045, inexplicably he once again has a human body. Klaus has apparently been human again for quite some time, and married to an unnamed woman for many years, as he has fathered at least one child who has lived long enough to grow up and have a child of his or her own, thus meaning Klaus has a grandson in this future. It was not specified whether Klaus will be the maternal or paternal grandfather of that little boy. The majority of the episode consisted of a story Klaus told his grandson about the past.

Relationship with Roger

Klaus and Roger's relationship is best described as a sibling rivalry. At times they hate each other and at other times they get along well. Roger is seen to be incredibly spiteful toward Klaus, saying things like "You can't participate Klaus, I hate you. I say that not out of anger but as a fact" in "Great Space Roaster" and "It's like you want to be kicked out of this family" in "The One That Got Away". Klaus does things to get Roger into trouble for his amusement, like when he tricked him in to eating Francine's potato salad in "Deacon Stan, Jesus Man". When a horrified Roger asked why Klaus would do something like that he just laughed and said "I'm German, it's what we do." In "A Piñata Named Desire", after Klaus made a comment about acting, Roger simply picked up Klaus's fish bowl, threw it across the room, smashed it against the wall, and walked out of the room as if nothing had happened while the fish lay gasping on the floor.

Although Roger has claimed to hate Klaus in the past, they do have a bond and are capable of being civil to each other such as when the head to Europe together in "Red October Sky". Further evidence of this can be seen in "Pulling Double Booty", as Roger and Klaus are quite content to watch a movie together and show annoyance when they must pause it as Stan intrudes with the cookie dough. Another example is that Klaus is often shown in the attic with Roger as he tends his fake bar in many disguises while in "Live and Let Fry" Roger dresses up as Klaus, the human, to help him get access to a family members will. In the end it turns out to be a trap to lure Klaus out of hiding and Roger gets beaten up due to the fact that Klaus owned some money to the East German Mafia. However, Klaus stays with him and keeps him company during his recovery, making sure Roger has sufficient pain medication to help him through it. Klaus was also the only member of the Smith family to remember Roger's birthday in "1600 Candles" and the alien seemed genuinely touched that he had bothered to prepare a birthday surprise for him.

Smith Family

Klaus has a strange obsession with the Disney film Beauty and the Beast. His view is that without Mrs. Potts; whom Francine played in "Stan of Arabia", the Beast would have killed himself years ago.

Klaus often has made up conversations and fantasies of situations. He could also be rather selfish and although he was attracted to Francine he did not attempt to save her during "Finances With Wolves", being more concerned with saving the human body he was currently residing in. However after Stan transferred him back into a goldfish's body, Klaus appeared to have lost some of his obsession with Francine.

Klaus often becomes caught up in make-believe or delusional states. This includes pretending to call people on an imaginary cell phone in "Bar Mitzvah Hustle", or driving by making motor sounds to a hair/nail salon for an appointment in "Man in the Moonbounce". In "Oedipal Panties", he convinced Steve to hold him so he could infect him with Ick, a fish disease, thus forcing Steve to spend time with him, while his other friends avoid him, out of fear of being infected.

In "Haylias", Stan asks Klaus for advice and he says "No. You only turn to me when there is no one else to turn to" and keeps reading. Indeed, Stan appears to secretly want Klaus dead, having had him mounted on a board in his personal heaven in "Rapture's Delight" and shot by the secret service in an extended dream sequence in "An Incident at Owl Creek". Though despite this they share a bond too; In "The Vacation Goo", Stan quite happily dumps his family into the goo and when Roger pulls the plug, they discover Stan watching sports with Klaus, both of whom are dressed in supportive team gear.

Klaus does seem to share a genuine friendship with Hayley, along with the ability to communicate telepathically with her at any given time in "Merlot Down Dirty Shame". Perhaps one of the most revealing moments of this is in "Choosy Wives Choose Smith", when Hayley announces to her mother she is going on the road for 15 weeks with Klaus to follow My Morning Jacket, after brief quizzing Francine responds with, "Okay, have fun you two!". Other examples can be found in many episodes. In "Dungeons and Wagons" for instance clearly shows the two working as friends quite gleefully after plotting against Steve. In "Man in the Moonbounce", Klaus mourns the fact that he can no longer go for a hair cut, and as such Hayley puts a lot of thought and effort into making a small wig for Klaus which she then styles for him in a pretend salon station much to his joy. And in "Oedipal Panties", Klaus tried to infect Hayley with his ick so that she would only have him to spend time with but his plan backfired when she revealed she had herpes. It also seems the Klaus has some sexual interest in Hayley. When Hayley gets a henna tattoo in "Frannie 911", they get into an argument which they decide to settle with a game of "Dare or Dare". Klaus takes a crack immediately and dares Hayley to kiss him. In "The Unbrave One", Jeff asks if anyone wants to have sex with Hayley because he was too tired; Klaus raised his hand with a smile on his face.


  • He was voiced by Dee Bradley Baker.
  • His Codename: Kids Next Door counterpart is Heinrich Von Marzipan, Because they both speak with a German accents and voiced by Dee Bradley Baker.