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|Hair color:||Dark Grey|
|Relatives:||Margaret (daughter), Denise Smith (wife), John (nephew)|
|Voiced by:||Roger Craig Smith|
|First appearance:||"Family BBQ"|
|Latest appearance:||"Rigby's Graduation Day Special"|
Oddly enough, Frank Smith is a human unlike the rest of Margaret's family. He has a large build, grey hair that used to be light brown, and a mustache and speaks with the impression of professional wrestler and former Governor of Minnesota Jesse Ventura.
Frank Smith is known be soft, with a rock hard exterior. He refuses to respect or give hand shakes toward any guy that his daughter brings home, unless they can do a better "mannonball" than he can.
Frank revealed to Mordecai that the reason he acts the way he acts is because he was afraid that any boy Margaret dates will take his daughter away from him. Fortunately, Mordecai managed to convinced Frank that his daughter will always love him and that he will always be her dad.
At the beginning of "Family BBQ", Frank shows his instant hatred to Mordecai. He often ignores the helpful things Mordecai does, especially that he only does it so Frank could like him. When he challenges Frank to a cannonball contest, Frank wouldn't give up, and eventually would take things too far. At the end, Frank became friends with Mordecai after he admitted he was impressed that he would win a cannonball contest just for Margaret. Mordecai and Frank have remained friends ever since.
In "The Thanksgiving Special", Frank took Mordecai and Rigby around in Chopper 6 in order to go to the competition and to get the turkey.
In 1000th Chopper Flight Party", Frank is happy to see Mordecai, and even calls him his "son". When Frank finds out that Mordecai has a new girlfriend, he is upset. However, he still has his respect for Mordecai, and offers him a piece of cake for his girlfriend "JC".
Minor or Mentioned
- Do Me a Solid (mentioned)
- The Thanksgiving Special
- I See Turtles (cameo)
- Regular Show: The Movie (cameo)
- Rigby's Graduation Day Special
- It is confirmed by J.G. Quintel that Frank is Margaret's biological father, as, to him, all the characters are people.
- He is the traffic reporter for the local news and flies in a helicopter named Chopper 6.
- He seems to be the only human in his family.