Beck (The Lady in the Lake)

Beck was one of seven clones created by Madame Kovarian on Demons Run after she stole Melody Pond's embryonic DNA. After the Eleventh Doctor raided Demons Run, Beck escaped on a ship with the other six clones. As part of his religious cult, Lake convinced Beck to die multiple times on Terminus Prime so he could covertly study regeneration and find out how long he was able to live. (AUDIO: The Lady in the Lake)

After Beck and the other six initial clones were lost following the Doctor's raid of Demons Run and River married the Doctor instead of killing him, Kovarian created at least four additional clones: Brooke, H-One, H-Two, and O. (AUDIO: The Furies)