Space Marshmallow

"Bloop-burble-schlorp!"

- 's Unlock Message

 is a limited-time character that was released on October 4, 2016, as part of the Treehouse of Horror XXVII Event. Together with the Meteor Egg they the seventh and final prize to be won in the event's Act 1.

It returned on October 26, 2018 during the Treehouse of Horror XXIX Event as a possible prize in the Mystery Jack-O-Lantern.

Trivia

 * From Season 18, Episode 4 “Treehouse of Horror XVII”.
 * While the prize name only mentions the as the prize, it's actually the Meteor Egg which unlocks the  the actual prize.