Recurring Guest Characters Guest Co-Host 7 guest appearances Guest Host 6 guest appearances Guest Co-Host 6 guest appearances Lisa Rubin 4 guest appearances Susanne Craig 4 guest appearances Vaughn Hillyard 4 guest appearances Yasmin Vossoughian 3 guest appearances Catherine A. Christian 3 guest appearances Danny Cevallos 3 guest appearances Kristy Greenberg 2 guest appearances Guest Host 2 guest appearances Paul Butler 2 guest appearances Charles F. Coleman Jr. 2 guest appearances Jeremy Saland 2 guest appearances Andrew Weissmann 2 guest appearances Guest Host 1 guest appearances Robert James 1 guest appearances Katie Phang 1 guest appearances Allie Raffa 1 guest appearances Tristan Snell 1 guest appearances ⇤ « 1 2 3 » ⇥