The actress's first scene in Agatha All Along had me convinced she was playing the Shadow King once again, to the point that if she isn't this character, I have to think she was encouraged by Marvel to channel that performance again for this series.

As for Lady Death, she's one incarnation of Death, a major antagonist in Marvel Comics. In the comics, she's rubbed shoulders with Thanos and Deadpool, and she's made appearances in the MCU before, too – sort of. Murals and statues of her can be spotted in Guardians of the Galaxy and Thor: Love and Thunder.