This study focuses on the context of a Saudi University to: (1) identify the behaviours and characteristics of toxic members in the workplace; (2) understand the impact of a toxic member within a workplace; (3) understand how leaders manage toxic individuals. The survey conducted comprised of seventy-five items developed based on four primary themes identified in the interview analysis, the key findings of the literature review, and some items used by Kusy and Holloway (2009), with some minor modifications. The survey was distributed to 500 faculty members at different colleges, including those in leadership positions, at MU. The percentage of return from the questionnaires was (26.8%); 134 questionnaires are valid for analysis. The results identified several behaviours and characteristics of toxic members in the workplace: prevalence of gossip, lack of confidence in others, and failure to accept others' opinions were in the top three. Toxic members within a workplace were found to lower workers' self-esteem, undermine confidence and even create financial crises. Leaders reacted by either forming a committee of professionals to treat the toxic individual, leaving the organisation, requesting the services of an external consultant or reducing the perceived causes of harmful behaviours. The research recommends creating a committee of professionals to deal with the behaviour of toxic individuals and identifying suitable external consultants. The researcher also recommends conducting qualitative studies based on the results of this research. Specially Regarding to Behaviour and harmful characteristics of some individuals, the results reveal a general mean of 2.915 (medium). Although the general degree of response is not high, this result exposes a critical level of toxicity and decision makers should be concerned about this outcome and its effects on universities performance.