Igor

Igor is Franny K. Stein's dog as well as her lab assistant. He is not a pure Lab, though. He is also part beagle, part poodle, part Chihuahua, part spaniel, part shepherd and part some weasely thing that isn't even a dog.

Personality
Igor is always eager to lend Franny a hand, even when there are times where Franny would rather work alone. He has nothing but unconditional love for his owner and is willing to do anything his owner asks him to.

History
Igor first appeared in the second book Attack Of The 50-Ft. Cupid, where he was given to Franny by her mother after she noticed her daughter being miserable about not having anyone to confide in with her experiments. Franny initially found Igor's insistence on helping her annoying, but reconciles with the dog when he saves her from the 50-Ft. Cupid.

In Frantastic Voyage, Franny tried to keep Igor busy during her more delicate experiments by inventing a television set for him to watch, which led to trouble when Igor accidentally ate a grape-sized doomsday device that Franny invented as a security measure for her ideas falling into the wrong hands. Franny then shrunk herself so she could travel inside Igor and deactivate the doomsday device before the entire world blew up, making her way out of Igor by changing the television to a root beer commercial so Igor would want to drink root beer. Franny then tried to destroy the television set, but Igor was able to convince her to not go through with it by changing the channel to a documentary on baby spiders.

In The Fran With Four Brains, Igor tried to distract the Franbots by pretending to be Franny, only to be turned into a tuna fish sandwich. Franny then worked to outsmart the Franbots into destroying themselves and tricked the last one into returning Igor to normal by asking her to prove her culinary skills by making raw weasel-dog before Franny and Igor destroyed the final Franbot together.

The Frandidate had Franny come up with the idea for the Frandidate suit after Igor gave her her plush bat Snookyfang right when she wanted it, accidentally sat on a chameleon and saw a parrot copy her shriek, realizing that she must be able to take on the appearance of what people want and be able to tell them what they want to hear if she is to win her school's election for class president. After Franny creates the Frandidate suit, she finds how effective it is when Igor sees the suit turn into Miss Wizzywozzle, the host of his favorite TV show. Later, when the Frandidate tries to take over Franny's body and persuade everyone to elect it King of the World, Igor uses Franny's ICU2 to show the Frandidate the face of Franny's mother, forcing the Frandidate to release its hold on Franny and confess to everyone that its promises were empty ones. Igor was then shown at the end of the book enjoying that the Frandidate was remade into a couch that had Miss Wizzywozzle faces on the area where he sat.

Igor's role in Bad Hair Day had him helping Franny learn the ways of hair styling and fashion and later trying to stop her pigtails after they became giant monsters, only to be swallowed by one of them. Franny thought for sure that her dog was done for, but Igor later returned alive and well after cutting his way out of the pigtail monster that ate him and cutting off his own fur to avoid getting swallowed again. Franny then brought her enlarged pigtails down by riding Igor while his eyelashes were elongated to enable flight. The end of the story had Igor sent to run a few errands, taking advantage of his eyelash-enabled flight by blowing a raspberry at the cat next door who torments him.

Igor ended up one of the people who became addicted to the Muffin Man's muffins in Recipe For Disaster, eventually snapping out of it when Franny used her Visualizer Helmet to show Igor what would happen if he didn't give up his muffin addiction.

Trivia

 * Igor is the character with the second most appearances in the book series, the first book Lunch Walks Among Us being the only book he doesn't appear in.