As the Fifteenth Doctor, played by Ncuti Gatwa, takes over the TARDIS for his first epic adventure

　　《红宝石公寓》说有一个中年人因为种种原因分不到单位的房子，三代五口人蜗居一个小屋儿。后来这个人得到一种办法能够把人自由变小变大，于是他就自己制作了一个模型公寓，把一家人变小搬进去住，命名为红宝石公