"Phantasmagoria is a CD-ROM horror-themed video game created by Sierra On-line for the DOS and Windows platforms, and later for the Sega Saturn in Japan. The game was released in 1995 and was followed by a sequel, Phantasmagoria: A Puzzle of Flesh released in 1996.
Made during the height of the "interactive movie" boom in the computer game industry, Phantasmagoria is notable for being one of the first adventure games to use a live actor as an on-screen avatar, as it starred Victoria Morsell. The game was released on seven CDs to accommodate the massive amount of video generated by this process, the creation of which was contracted by Sierra to Kronos Digital Entertainment (who had previously worked on Sierra's King's Quest 6). Large portions of data were repeated on each CD, to avoid disk swapping when playing the game."
Source: Wikipedia, "Phantasmagoria_(video_game)," available under the CC-BY-SA License.