Gerard Way on Netflix's Umbrella Academy Show and Young Animal/DCU Crossover | SYFY WIRE
The Group Hopper - SNL
Riverdale Producers on Musical Crossovers with Flash, Supergirl (Wondercon 2017) | SYFY WIRE
A crossover is the placement of two or more otherwise discrete fictional characters, settings, or universes into the context of a single story. They can arise from legal agreements between the relevant copyright holders, unauthorized efforts by fans or common corporate ownership.