Morty was building a soapbox racer with his grandfather Rick in the garage when Rick started to goof around with a water hose. As Rick laid down the hose he expressed how he appreciated spending time with his grandson Morty, but was interrupted when a green goo monster appeared in front of their house. Morty didn't understand the creature, but Rick knew why it was there and threw his portal gun to his grandson just before being impaled by the monster. Just before Rick died, he told Morty to warn other Ricks that "it's starting" as Morty ran away.
Morty opened a portal and came to Dimension C-132, meeting his C-132 counterpart and his grandfather just before collapsing. He later woke up confused and scared in Morty's room, where he recounted the event in his own dimension. Rick (C-132) and Morty (C-132) left him in that room and went to escape from the monster, leaving him easy prey for the Goo Monster as it appeared shortly after.