The improv comedy show "Whose Line Is It Anyway?" has had multiple hosts over its run:

• The original U.S. version was hosted by Drew Carey, featuring performers like Ryan Stiles, Colin Mochrie, and Wayne Brady. These Drew Carey episodes are now primarily available for streaming on HBO Max, as other platforms like CW Seed no longer carry them

• The current version of the show is hosted by Aisha Tyler, with the same core performers Ryan Stiles, Colin Mochrie, and Wayne Brady continuing their roles. This version is available on platforms including Amazon Prime Video, The Roku Channel, Pluto TV, and The CW network

Thus, "Whose Line Is It Anyway?" was originally hosted by Drew Carey and is currently hosted by Aisha Tyler. The main performers have remained consistent across versions.