Season 5 breaks from the murder mystery aspects to switch to a spy narrative, focusing this time on Todd Stevens as a newly minted spy for his security agency, setting the bears off on a madcap race to keep a dangerous computer virus from ending up in the wrong hands and sniff out a mole from the agency.

Todd coerces Wood into posing as a Lucha Libre wrestler in order to get close to a friend of Chase's, a professional wrestler named Crusher, who is known for his killer bear hugs. But despite Todd's assurances that Wood will never have to get in the ring, Nelson's overzealous performance as a wrestling coach proves otherwise.

The Bears converge on a Mexican restaurant with Nelson, Reggie and Wood posing as members of a mariachi band and Todd as a waiter in order to set a trap for Chase. But unfortunately when Reggie and Wood allow their personal dramas take center stage, the carefully orchestrated plan blows up in their faces.

After Todd is nearly drowned following an aborted assassination attempt and the killer escapes, the Bears enlist the aid of Winters and Martinez in order to find Chase Hansen before it's too late. Meanwhile, Bjorn reports back to Victor Garcia to face his wrath after failing in his mission to take out Todd.

Unbeknownst to the Bears, Todd launches a sting operation in a Mexico City park known for its gay cruising in order to finally snare Chase Hansen and retrieve the thumb drive, but things don't go exactly according to plan when Reggie and Wood, trying to forget the pain of Chase's betrayal, both hook up with the wrong tricks.

In the rip-roaring, hair-raising season finale, Nelson, Todd, Winters and Martinez form the Wild Bear Bunch and descend upon a remote Mexican village right out of a spaghetti western film in order to rescue Reggie and Wood from Victor Garcia's clutches, but the menacing crime lord has no intention of allowing any of them to leave the country alive once he has the thumb drive in his possession.