John Constantine

In Season four, the team has to deal with accidentally releasing numerous magical threats that have long since been locked away for being too dangerous. Whilst having dealt with magic users in the past and had (one current, one former) members who derived their power from magic, it quickly becomes clear that they are hopelessly out of their depth. So Sara turns to her old friend John Constantine, a professional warlock and expert in magical problems.

Example of:
Token Wizard