Ten minutes into the premiere episode of the wonderful new Marvel series Agatha All Along, you might worry that you pressed play on the wrong Kathryn Hahn show. Instead of the powerful witch Agatha Harkness, whom Wanda “Scarlet Witch” Maximoff defeated in the finale of WandaVision, her character is Agnes, a mouthy, flannel-sporting, rule-breaking police detective investigating a murder in a prototypical small town.