Agents Brick and Savannah

"Savannah: We get these kids, get whatever they know, get our limo back, and get back to doing what we do best. Brick: Ha ha! Everything. Savannah: You know us so well."

- Brick and Savannah tracking down Zack and Melissa.

Agents Brick and Savannah are recurring antagonists of the Disney XD show Milo Murphy's Law. They are a duo of time-travelling secret agents working for the Time Bureau and the rivals of the duo Balthazar Cavendish and Vinnie Dakota.

They were voiced by Brett Dalton and Ming-Na Wen.

Personality
Being as two of the most competent agents in the Time Bureau, Brick and Savannah take their jobs seriously in prevent world catastrophes. Despite their good reputation, they are very arrogant in nature as they make no secret in mocking Cavendish and Dakota of their incompetence as time-travelling agents; even willing to get them in trouble for not performing the tasks as they were ordered to, much to both Cavendish and Dakota's anger. They also seem to be quite deluded when they suspected Milo Murphy's friends Zack Underwood and Melissa Chase of being involved in their limo's disappearance (despite the fact that the kids had nothing do with it), even willing to catch them in a net and steal Milo's backpack for interrogation.

Time Out
Brick and Savannah were first seen in the episode attending a party that Cavendish and Dakota are also attending, much to their disdain. After fighting off several goons, they steal a vial of unknown liquid from a hidden safe, intending to deliver it back to 1983. During a ride at the duo's time-traveling limo, Cavendish and Dakota voiced their outrage on the horrible treatment that Brick and Savannah has given to them, but Savannah justified this as claiming that Cavendish and Dakota are the worst time-travel agents ever, pointing out their inconsequential mission of preventing the extinction of the pistachio only because their boss Mr. Block liked them. Even Mr. Block confirmed of this, leaving both Cavendish and Dakota upset.

Missing Milo
Brick and Savannah are seen again attending another party trying to find a cure for the common cold, just as Cavendish and Dakota attempt to borrow their limo so that they can report their successful mission of preserving a rare pistachio plant at Milo Murphy's high school. However, security personnel spotted all four agents and threw them out of the party, and a spiteful Brick and Savannah refused to loan their limo to Cavendish and Dakota. It wasn't the case until Milo arrived to return Cavendish's communication device, resulting both Brick and Savannah to fall off a cliff into the water. This allowed Cavendish, Dakota and Milo to use the limo to head back to 2175, where they are horrified to learn that preserving the pistachio plant only led to the creations of the Pistachions (led by the evil King Pistachion) and their takeover of the world.

Climbing back to the scene, Brick and Savannah spotted Milo's friends Zack and Melissa discovering Milo's backpack and his dog Diogee left in the scene. Brick attempts to take the backpack, but Zack swipes it away, angrily demanding to know who they are. Brick and Savannah attempt to goad the kids into handing over the backpack by claiming that they are "Certified Public Accountants", but the kids refused to believe this and instead ran off with Diogee. Believing that the kids may have something to do with the limo's disappearance, Brick and Savannah pursue Zack and Melissa, eventually cornering them in the sewers. Savannah attempts to trap the kids with a net, claiming that she interrogates better with the captives tied up, but they are saved by an undergrounder named Scott, who traps Brick and Savannah in a cheese pit filled with rats and a wolf, much to their horror. This allows Zack and Melissa enough time to escape back to the surface while Brick and Savannah are left yelling in fear.

Eventually, Milo gets Diogee to destroy the pistachio plant, resulting King Pistachion and his horde to be wiped away from existence, much to Cavendish and Dakota's relief. Having escaped the pit and being unaware of the events, Brick and Savannah confronted Cavendish and Dakota by demanding them to hand over the limo keys. Knowing that that they had no further use of the limo since the Pistachions are seemingly gone for good, Cavendish and Dakota happily obliged by taunting them that the limo is already destroyed by the Pistachions before leaving, much to both Brick and Savannah's distraught.

Perchance to Sleepwalk
Brick and Savannah appeared near the end of the episode, as they have their limo fixed and returned from a mission saving Texas from oblivion. Returning to the present, they spotted Cavendish and Dakota destroying several pistachio trees, still unaware of the fact that they're only doing it to prevent the Pistachions from existing in the timeline. An annoyed Brick and Savannah reported this to Mr. Block, who angrily demotes Cavendish and Dakota to cleaning outhouses in the Renaissance. Brick and Savannah are delighted by this, only to find out in dismay that Mr. Block is assigning them the pistachio preservation. This drove an angry Brick to kick a rock into a sleeping bear, who angrily chases Brick and Savannah in retaliation.

The Race
Brick and Savannah are seen operating a pistachio cart near the finish line for the incoming race. They seem to be rather unhappy about their new occupation as they want to get back doing their regular missions. At the same time, Cavendish and Dakota plan to destroy the pistachio cart to preserve the timeline, but Murphy's Law comes into effect (since Milo is participating in the race), sending them into 1875. Eventually, Cavendish and Dakota were able to travel back to the present, crashing into the finish line and destroying the pistachio cart for good. This leaves a frustrated Brick and Savannah to fume over their failure.

Milo Murphy's Halloween Scream-a-Torium!
Brick and Savannah are seen in a snowy mountain using skis to evade several goons. Upon reaching over to a cliff, they tried to activate their parachutes, only to realize too late that there are Halloween costumes inside as Dakota accidentally took their gadget bag by mistake. This left Brick and Savannah to plunge into a snowdrift wearing the costumes, and a humiliated Brick (wearing clown makeup and attire) swears to kill both Cavendish and Dakota for this before being frightened by Savannah's costume.

Fungus Amongst Us
Brick and Savannah are seen being captured by several Pistachions (thanks to King Pistachion's son Derek changing the timeline with his own plot and army of Pistachions to take over the world). The Pistachions even destroy their limo (as well as Cavendish and Dakota's time vehicle) to ensure no one go back in time and alter their existence. Because of this, Cavendish, Dakota, Milo and Orton Mahlson are forced to team up with the former evil scientist Heinz Doofenshmirtz, who is revealed to be the former identity of Professor Time (the future creator of time-travel that led to the foundation of the Time Bureau).

The Phineas and Ferb Effect
Brick and Savannah don't appear in the special as they are still held prisoner by the Pistachions. However, Doofenshmirtz manages to concoct a successful plot in wiping out the Pistachions by creating his first time machine and collecting orange soda to take down several Pistachions. Doof's future self then arrived on cue to transport Orton back to 1955 and use the soda to destroy Derek, wiping the Pistachions from existence and restoring the timeline for good, much to Milo, Cavendish and Dakota's delight.

It is unknown what happened to Brick and Savannah afterwards, but it is likely that they would be freed from captivity along with the other people.

Trivia

 * Both of their voice actors (Brent Dalton and Ming-Na Wen) were known for starring in the famed Marvel TV series Agents of S.H.I.E.L.D., where they played Grant Ward (a HYDRA mole) and Melinda May (a more heroic S.H.I.E.L.D. spy). It is possible that those two characters served as a homage to both Brick and Savannah.
 * It may be an exaggeration to call both Brick and Savannah as villains as they prefer to saving the world from genuine danger, but they still count as threats to Cavendish and Dakota as they tried to thwart their intention of destroying pistachio plants, unaware of the fact that preserving at least one would lead to the creation of the monstrous Pistachions. They even tried to kidnap two innocent teenagers for interrogation after mistakenly believing that they had something to do with stealing their limo.