News surfaces about Mac's Dad, Luther, being a murder suspect. Mac goes into full "P.I." mode to clear his father of any wrong doing.

"Asskickers" isn't just a hot new way to work out; it's a way of life...and maybe a cult.

Charlie thinks Mac's mom is holding his mom hostage so the gang installs spy cameras in their house. They discover the moms are quite entertaining once Dennis makes edits to the footage.

To one-up the guys, Dee has organized an "all-female reboot" of the Wade Boggs challenge on a first-of-its-kind, all-female flight headed to L.A. for the women's march.

The gang's in Dublin where Dennis ends up helping Frank with some of his business's dirty work. Mac and Charlie learn about their Irish heritage. Dee rushes to the set of an Irish soap opera, where she will play an "Obnoxious American MILF."

After Frank shoots Dennis and Dee, they resolve to take Frank’s gun away. Mac and Charlie go on a road trip with their moms to get their inheritances -- for Mac, it’s letters written by his grandfather which have fallen into his Uncle Donald’s hands, while for Charlie, it’s a jar of teeth that is now in the hands of his sisters, Bunny and Candy.

The Gang’s going to be on Bar Rescue but a series of bad omens leads them to believe they are all cursed. They set off to undo the curses and make amends to those they’ve wronged, while Mac, who’s on a run of good luck, meets Chase Utley and invites him for a catch.

Charlie cheers on Frank at a local chess tournament against a Russian grandmaster. Dennis helps Mac and Dee find boyfriends after getting irritated by Mac’s current boyfriend, Johnny.