Iranian intern Arastoo confesses to everyone that he has been faking his accent and explains why he did so.
Booth's son Parker seems concerned that his dad does not have a girlfriend.
Meanwhile, newlywed Angela and Hodgins decide to travel.
The episode "The Gamer in the Grease" features promotion of the film Avatar.
The cross promotion was suggested by Avatar producer Jon Landau and the episode features recurring actor Joel David Moore, who also appears in Avatar as one of the secondary protagonists.
Funding is cut back at the Jeffersonian, leaving Wendell's (Michael Grant Terry) scholarship at risk, but anonymous donations are made, saving his internship.
Booth deals with effects of his coma, causing him to relearn how to fix the broken pipes for his sink, instead of paying for a plumber.
Heather Taffet aka the Gravedigger is put on trial for her crimes, and the team's strong case against her leads to a conviction where she is finally put away, but warns Brennan "that it's not over".
In the season finale, many of the characters begin to embark on trips that will take them out of the country for one year, intending to return and pick things up where they left off one year from that day.
The victim was known as "The Iron Leprechaun", who competed in a wrestling league.
Booth, still dealing with effects from his brain tumor, has problems with his aim and must be re-certified for FBI marksmanship. Gordon Wyatt (Stephen Fry), who is now a chef, in hopes of overcoming the problem.
The fifth season of the American television series Bones premiered on September 17, 2009, and concluded on May 20, 2010, on Fox.