The Master (Doctor Who)Harkness about the time vortex and time travel in general. He used the Chameleon Arch to temporarily place his Time Lord identity within a Fob Watch. This
Time War (Doctor Who)gains control of the Cruciform, the Master deserts his post, used the Chameleon Arch to disguise himself as a human and escapes to a time period shortly
Time Lordto conceal their Time Lord nature, and become a human, by using the Chameleon Arch – a device that stores their "essence" and memories in an innocuous
Fugitive Doctorthe Judoon", disguised as human tour guide Ruth Clayton by means of a Chameleon Arch. As Ruth, she lives alongside her "husband" Lee in 21st century Gloucester
Fugitive of the Judoonthe Doctor to be a future version of her, and reveals that she used a chameleon arch to hide herself from her former associate Gat. Ruth's TARDIS is then