Have Rocket, Will Travel (1959)

Plot

Three bumbling janitors at a space center unwittingly launch themselves to Venus. There, they meet a chatty unicorn, a massive fire-breathing tarantula, and a sinister alien computer that has wiped out humanity and conjured evil doppelgangers of the Stooges. After an outrageous series of misadventures, the trio manages to escape and return to Earth, where they are celebrated as heroes. Their absurd journey through bizarre encounters and perilous challenges showcases their signature slapstick humor, making for a delightfully chaotic escapade.