The Munsters: Bats of a Feather (1965) (TV)

Synopsis [spoilers]: Eddie is choosing an animal for a pet fair at school; Lily thinks their cat would be the best choice, but Herman prefers that he take Spot, their dragon. Grandpa in turn suggests Igor the bat. Spot refuses to leave his refuge under the staircase, so Igor seems to be their only choice, since the cat is considered too unappealing. Herman calls Igor an idiot and, feeling insulted, it leaves the house. Grandpa morphs into his batlike guise so that Eddie can take him; they don't tell Eddie that it's Grandpa though -- he still thinks it's Igor. At the fair, Bat-Grandpa scares people by flying around the room. Eddie comes home with a squirrel: he has traded his bat for it with a classmate -- only for the weekend, he says. They phone his classmate but he sold the bat to his father who is a scientist at NASA. They all fly to Washington, to the scientist's lab where Grandpa is being held. The NASA scientist who has Grandpa is thinking of sending him to space in an experimental flight; Grandpa passes out when he hears it. They get a female bat to make him company. When the Munsters arrive at the NASA facility, Herman goes to talk to the guards at the gate; they think he is some experiment who escaped from the lab, and tell him to go back inside. Herman gets to the lab, but mistakes the female bat for Grandpa, and takes her. When the scientists begin to experiment with Grandpa, they make him fly towards a wall in order to test his radar; he flies right into it, though. He then takes the opportunity and flees the lab; when he is out of the scientists' sight he morphs back into human form; he then reaches the front gate and asks the guards to call him a taxi to the airport. When he gets home, they are all trying to make the female bat turn into Grandpa. Igor returns to the house and falls in love with the female bat. Eddie asks about it and Grandpa tells him he should have a conversation with Eddie about "the bats and the bees".

Saw it dubbed in Portuguese.