Catula tries to rid the castle of a leech that's been drinking up His Tomato juice supply. If anyone has any recordings of Wake, Rattle, and Roll with these segments reach out to me if you can.
Produced by the Van Beuren Studios, and distributed by RKO Pictures. The series lasted from 1931 to 1933. When Official Films purchased the Van Beuren library in the 1950s, the characters were renamed Dick and Larry to avoid confusion with the famous cat and mouse team of the same name. All of these cartoons are in the public domain.
The "Computer Critters" were produced by Buzzco Productions and were shown in-between cartoons on Saturday mornings over the ABC-TV network, back around the mid-1980s.