A novel idea is that there is an alternative pathway for the generation of new types of innate T cells, which are totally different from previously recognized ones. These cells include natural Th1 cells and Eomes+ innate CD8 T cells. This idea was confirmed both by in vitro and truely in vivo settings. From this book, reader will have an opportunity to easily get access to important knowledge about highly interesting and provocative concept of new types of innate T cells, because current debates are now centered around issues regarding innate T cells.