🐙 Yivo is a sentient, extraterrestrial being from another universe, who communicated with universe "gamma" (the Futurama main universe) through the space-time hole called "the anomaly" made in "Bender's Big Score". Yivo uses the pronouns "Shkle / Shkler". Yivo appears in the second Futurama direct-to-DVD movie, The Beast With A Billion Backs.
In another universe, there existed only one sentient being, Yivo. For a trillion years, shkle was satisfied with shkler life as the lone being of that universe. But when shkle looked across immensity, shkle saw the Big Bang and said, "Whoa. Who's that?". Shkle realized that the newly formed universe was shkler soulmate, including every living being in it. Some centuries ago, shkle sent an image of shklimself into the artists of the gamma universe, portrayed as Heaven.
Shkle makes Fry the pope of a new Religion, whose adherents are encouraged to "love the tentacle". Yivo used shkler "gentacles" (as proclaimed by Leela) to have sex with every living being in the gamma universe except Leela, unbeknownst to them.
It is inconsistent within the story as to whether the planetary mass is Yivo or whether the planetary mass is a manifestation of Yivo who is in fact a sentient universe.