<Li> Principal Mullins (Jama Williamson) is the principal of the school . In the first season, she is a recurring character, but is promoted to a main character in the second season . </Li> <Ul> <Li> Clark (Ivan Mallon) </Li> <Li> Kale (Brec Bassinger, seasons 2--3) </Li> <Li> Asher (Will Kindrachuk, seasons 2--3) </Li> </Ul> <Li> Clark (Ivan Mallon) </Li> <Li> Kale (Brec Bassinger, seasons 2--3) </Li>

Who plays clark in school of rock nickelodeon