Frantastic Voyage

Frantastic Voyage is the fifth book in the book series book series.

Plot
Franny K. Stein needs something to keep Igor busy during her more delicate experiments, getting the idea to create a television set to distract him after seeing her mother keep her brother in line by turning on the TV.

The TV succeeds in keeping Igor busy when Franny doesn't need his help, but proves to have its drawbacks, such as Franny almost activating a doomsday device designed to blow up most of the Earth when Igor told her of an alien invasion that was just a sci-fi movie Igor was watching.

After Franny leaves her doomsday device near a plate of grapes Igor is snacking on, Igor accidentally eats the doomsday device and turns out to have activated it by biting down. Franny then decides she can prevent the explosion by shrinking herself down and entering Igor's body through his nose.

As soon as Franny finds the doomsday device, she then has to find a way to get out quickly before the device goes off, so she decides to modify her comm link so she can use it to change the channel on Igor's TV set. After a few channel changes don't exactly get the result Franny wanted from Igor, Franny manages to get Igor to drink root beer by changing the channel to a root beer commercial. Igor then ends up burping Franny out, who returns to normal size and quickly shuts off her doomsday device in the nick of time.

Franny then gets ready to destroy the TV, but is convinced by Igor to keep the TV instead when he changes the channel to a documentary on baby spiders.