A friend shipped Mickey a baby elephant named Bobo as a playmate for Pluto. Pluto's first introduction is to Bobo's trunk, through a fence. He's not thrilled, and marches away. The playful Bobo grabs Pluto's tail and follows. Pluto's devil self tells him he's being replaced, and tells him to attack with red pepper.
While carrying on their usual hi-jinks, they inadvertantly stow-away on a spaceship bound for Mars. They meet up with the local Martian residents and cause them to invade the Earth, aided by the "Invincitron", a vacuum-wielding giant robot.
The film centers on a solitary character who lives alone in an apartment, where strange, dreamlike events blur the lines between perception and reality.
Hoping to rid a small western community of its corrupt political machine, Ken Marshall (Ken Maynard) runs for sheriff against the bad guys' candidate and wins the election.
Joyce Reid, a wealthy young debutante, stows away on a cargo ship to China, carrying as passengers her dashing aviator sweetheart, Dan Bailey and and her munitions-producing father, E.
Oswald the Rabbit and his little brother catch the Slumberland Express and it carries the assorted animals to childhood's dream of paradise - an amusement park where all the games are free, and windows are provided just to be broken by an abundant supply of free rocks, and old men wear silk hats to provide targets for snowballs.