Title card.
"The Creeps" is a Halloween episode of the animated TV series Adventure Time.
Plot
Finn, Jake, and some friends attend a masquerade dinner with a mysterious host. However, the host then reveals himself as a murderous ghost that will possess the body of one guest to kill everyone else. The night quickly turns into a who-dun-it as the guests start to meet their gruesomely gory demises.
See the article on The Creeps on Fandom's Adventuretime wiki.