Fantastic Four

Peter was surprised by Black-Clad Loki's appearance, but not particularly shocked. As early as on that desolate planet beside Ego Planet, Peter and the others had learned through the time rewind device that while Black-Clad Thanos traveled across numerous parallel universes, he was also gathering extraordinarily powerful variants of villains from every parallel universe through a method akin to raising venomous insects. Although this Black-Clad Loki had not appeared there, Loki had indeed served Thanos long ago.