This Special Issue positions Interactive Digital Narratives (IDNs) as a coherent, critically urgent, and future-facing interdisciplinary research field, bringing into sustained dialogue scholarship and practice across electronic literature, digital arts, performance studies, Human-Computer Interaction, AI and creativity research, game studies, and computational design. While these domains have historically advanced interactive narrative innovation in parallel, this issue foregrounds the shared research problems that now define IDNs as a distinct area of inquiry: how narrative coherence, user agency, and computational systems can be meaningfully reconciled in interactive media.