Question: who's line is it anyway original cast
Answer: version of Whose Line Is It Anyway ? features four performers , two of whom , Colin Mochrie and Ryan Stiles , were regular , permanent performers throughout the original format , having featured prominently in the UK original ; Stiles since his first appearance in its second season in 1989 , while Mochrie since his first appearance in the following season in 1991 , with both making regular appearances in the UK version from 1995 until its end in 1999 .