Mantis Toboggan, M.D. was a pseudonym briefly used by Frank Reynolds to capitalize on the failed relationships of Dennis and Mac. The character came about when Dennis asked Frank to pose as a made up doctor named "Dr. Toboggan". In the episode, Mac compared Frank's sexual gains to feeding like a "mantis." Frank liked Mac's word choice, and requested to Dennis and Mac to receive the nickname "Mantis." After refusal on Dennis' part, Frank used "Mantis" as "Dr. Toboggan's" first name. ("The D.E.N.N.I.S. System")
Reynolds once again assumed the moniker in a misguided attempt to make a "viral video" for Paddy's Pub to increase their web presence. Reynolds mistakenly thought the concept was a "virus video" centered around an actual virus, and used Toboggan as a central figure to proclaim that people who came to Paddy's would be "infected". ("The ANTI-Social Network")
While the gang is attempting to break Wade Boggs' alleged beer drinking record on a cross-country flight, Frank gives another passenger a potentially lethal dose of sleeping pills to prevent him from diminishing the on-board beer supply. When the passenger begins to experience severe symptoms, the stewardess calls for a doctor. A drunken Frank approaches claiming to a be a doctor; he introduces himself as "Mantis Toboggan." ("The Gang Beats Boggs")
- Season Five: The D.E.N.N.I.S. System
- Season Seven: The ANTI-Social Network
- Season Ten: The Gang Beats Boggs
- Frank: Dennis, I've been looking all over for you! Where ya been? (To Caylee) Hello. Dr. Toboggan. Nice to meet ya.
- Dennis: Frank, what the hell are you doing?
- Frank: Actually, it's Mantis. Mantis Toboggan, M.D. I got your test results! You're positive! You've got the HIV! Yes, AIDS, big time! You've got the AIDS, big time!