An international crime boss offers to surrender if he's allowed to return to the United States to watch his daughter walk down the aisle; Mac and the team crash the wedding to ensure the crime lord doesn't run.
Mac helps a group of researchers trapped in the Arctic Ocean on a research vessel; Jack kidnaps Elwood, only to end up helping him deal with his past; Bozer and Leanna find themselves handcuffed together in a new test.
Mac's meeting with Desi's parents goes sideways when her brother finds himself in trouble and desperately needs their help. Russ and Matty must ask an old nemesis for assistance when their new recruitment candidate is kidnapped.
When Mac's nemesis rigs Mac's house with explosives and traps him and Jack inside, Mac uses a karaoke mic and an audio transformer to let the team know that the bomb is a distraction for a bigger one.
Murdoc abducts MacGyver's girlfriend to force Mac to help him rescue his son from a kidnapper; a dangerous person from Murdoc's personal life shows up, giving Mac a glimpse into the villain's past.
Mac, Riley and Bozer go on a weekend of survival training, then they run into a violent group of criminals who are searching for a lost crate of money. Jack and Matty go on a road trip to place Ethan and his family in witness protection.
When Nicholas Helman resurfaces to carry out a killing spree, the team is forced to get help from the one person who knows him best- his protege, Murdoc.
A cunning new adversary's carefully crafted plans force Mac to make an impossible choice: save the life of a friend, or save hundreds of innocent lives; Mac receives new information that will drive a wedge between him and his father.