Miles Knightly robbed a tomb that Rick Sanchez and Morty Smith planned to steal from. After finding his calling card, an origami crane, Rick took Morty to go confront him at "Heist-Con".
After assembling a crew just to get in, Rick went to confront Miles as he was hosting Heist-Con over stealing from a tomb they had planned to steal from. To settle their differences, Miles challenged Rick to a "Heist-Off" where the loser would have to join the winner's heist crew. The heist involved the theft of the Crystal Skull of Horwitz, however, soon after making the challenge, Miles revealed that Miles' Heist Crew had already stolen the skull for him and that they had been joined by the three members of Rick's crew who he had brought to the convention hall to get in. However, Rick then revealed that he already knew about Miles' plan thanks to his robot Heistotron and that he had not only intended for his crew to defect to Miles' crew, but actually brainwashed them using Heistotron to steal the Crystal Skull for him and deliver a fake to Miles.
Rick then had Heistotron brainwash all of the attendees of Heist-Con to join his crew and ordered them all to steal Heist-Con. This included stealing Miles by killing him and tearing his body into pieces, including tearing off his face and stealing his gold skull.
Ricks and Mortys