Narrating is a crucial activity in theatre rehearsals. Through this activity, narratives are performed, expanded, reinterpreted, or even completely improvised. The communicative practices used by theatre professionals to develop a play as a theatrical narrative have rarely been researched, both in linguistics and theatre studies. Therefore, this paper addresses how actors, directors, and other members of a theatre production collectively develop monologues as self-contained narratives within a play. The research focuses on how narrators and listeners, as an interactional ensemble, use multimodal actions to realize such monologues. Surprisingly, the co-narrators don’t appear to imagine their future audience but construct the narrations in situ with and for the present members. This observation especially becomes evident when mobile eye-tracking glasses measure the co-narrators’ gaze behavior. It shows that members of a theatre rehearsal perform different activities (e. g., improvising, reading, prompting, instructing, discussing, monitoring) with regard to local interactional requirements. This paper illustrates the procedures with which theatre-makers produce monologues as multimodal narratives and highlights the differences that distinguish such narratives in theatre from spontaneous everyday storytellings.