Abbott and Costello Go to Mars

Orville (Lou Costello) is the oldest orphan at the Hideaway Orphans Home. He accidentally winds up inside a truck heading to a top-secret laboratory, where he is placed under the guidance of lab worker Lester (Bud Abbott) to help load supplies onto a rocketship. While on board with Lester, Orville hits the ignition button and the rocketship blasts off, flying across the country to New Orleans, where New Orleans Mardi Gras is in progress. They exit and witness "hideous creatures", which are actually costumed celebrants, and conclude that they have successfully landed on Mars.