Guest Stars Isaac C. Singleton, Jr. voices Thanos Jonathan Frakes voices J'Son Troy Baker voices Loki Travis Willingham voices Thor Trevor Devall voices Fandral Cree Summer voices Victoria Kevin Michael Richardson voices Heimdall Vanessa Marshall voices Meredith Nika Futterman voices Angela Travis Willingham voices Hogun Jonathan Frakes voices Narrator Kevin Michael Richardson voices Knute Trevor Devall voices Rocco Vanessa Marshall voices Dr. Mora David Sobolov voices Nurse Max