Danny will have a fight with his sister in the new episode of "Hawaii Five-0" season 7.

The series returns this December with its new episode, titled "Ka Luhi," meaning "The Burden."

Rumors are rife that the upcoming episode will introduce Danny's sister, whom Danny will have a fight with. Based on the synopsis for episode 10, the siblings will argue since Danny does not want his sister to get close to a co-worker.

"Five-0 investigates the 10-year-old cold case of a missing teen when a boy suffering from PTSD undergoes hypnosis and realizes he may have witnessed her murder. Also, Danny's sister, Bridget, visits Oahu for a business conference, and he suspects that she may be getting too close to a co-worker," reads the synopsis for the episode.

According to reports, a crossover is coming to the show soon as "MacGyver" characters make an appearance in the series. "MacGyver" is also executive-produced by the producer of "Hawaii Five-0," Peter Lenkov.

In a recent interview, Lenkov revealed that the idea of a crossover was never easy for them, since the creator should master both series so as not to frustrate fans.

"I took a shot out of the MacGyver pilot in a flashback to Jack in Afghanistan. The shot was of the saddle of his gun. I still would like to take advantage of that. Somehow we'll do a crossover and those two guys knew each other. I'm hoping," said Lenkov.

"Hawaii Five-0" season 7 airs every Friday on CBS.