This article reports on two case studies designed to investigate the use of Mursion, a mixed-reality simulation platform, in two language teacher preparation programs. The first case study involved eliciting the attitudes of MA in TESOL [Teaching English to Speakers of Other Languages] pre-service teachers (PSTs) toward the mixed-reality simulation environment, and the second explored how themes uncovered in the first study transpired as novice PSTs working towards foreign language teaching credentials taught in the simulation for the first time. The results of the two case studies showed that while PSTs with teaching experience argued that the simulations did not reflect the realities of real classrooms, PSTs with limited teaching experience found the simulations to be extremely valuable since they helped them develop much needed confidence.