The document outlines the agenda and objectives for a biology class lesson on cells and cell theory. It discusses key scientists like Hooke, van Leeuwenhoek, Schleiden, and Schwann and their contributions to early microscopy and the eventual formulation of the three principles of cell theory: that all organisms are made of cells, cells are the basic unit of life, and new cells are produced from existing cells. The lesson will include warm-up, learning activities, and a "Name That Guy" game to review the scientists.