Agents Brick and Savannah

Agents Brick and Savannah are recurring antagonists of the famed Disney XD show Milo Muprhy'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 Dallon 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. However, they are very arrogant in nature as they make no secret in mocking Cavendish and Dakota of their incompetence as time-travelling agents, much to both Cavendish and Dakota's anger. They also seem to be quite deluded when they suspected Milo Murphy's friends Zach and Melissa of 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 bad guys, they uncover 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 justifies 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 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, Brick and Savannah refuse to let them, but Milo arrives to return Cavendish's communication device, resulting both Brick and Savannah to fall off a cliff into the water. This allows 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 King Pistachion) and their takeover of the world.

Climbing back to the scene, Brick and Savannah spotted Milo's friends Zach and Melissa discovering Milo's backpack and his dog Diogee left in the scene. Brick attempts to take the backpack, but an angry Zach swipes it away, demanding to know who they are. Brick and Savannah attempt to curry the kids into handing over the backpack to them by claiming that they are "Certified Public Accountants", but the kids are not convinced and walk away with Diogee. Claiming that the kids may have something to do with the limo's disappearance, Brick and Savannah pursue Zach 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 pit filled with rats and an angry wolf, much to their horror. This allows Zach and Melissa enough time to escape back to the surface.

Following the deaths of King Pistachion and his horde, Brick and Savannah (having escaped the pit and being unaware of the events) confronted Cavendish and Dakota, demanding them to hand over the limo keys. Knowing that the limo has been destroyed by the Pistachions and that they had no further use of it since the Pistachions are seemingly gone for good, Cavendish and Dakota happily obliged by taunting them that the limo is already destroyed 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 returned from a mission saving Texas. Returning to the present, they spotted Cavendish and Dakota destroying several pistachio trees (as they don't want the Pistachions to exist in the timeline). An annoyed Brick and Savannah reported this to Mr. Block, who subsequently demotes Cavendish and Dakota to cleaning outhouses in the Renaissance. Brick and Savannah are delighted by this, only to find out in horror that Mr. Block is assigning them the pistachio preservation. This incited an angry Brick to kick a rock into a sleeping bear, who then 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 this 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, sending them into 1875. Eventually, Cavendish and Dakota were able to travel back to the race, effectively destroying the pistachio cart for good, much to both Brick and Savannah's anger.

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). This prompted, Cavendish, Dakota, Milo and Orton Mahlson 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. Eventually in The Phineas and Ferb Effect, Doofenshmirtz manages to concoct a successful plan in wiping out the Pistachions by creating another time machine and collecting orange soda to wipe out Derek and the Pistachions from existence, thereby 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 released from captivity along with the other people, though it may be unlikely that they would hear about the event.

Trivia

 * Both of their voice actors (Brent Dallon and Ming-Na Wen) were known for starring in the famed Marvel TV series Agents of S.H.I.E.L.D., where Dallon played Grant Ward (a HYDRA mole) and Wen played Melinda May (a more heroic S.H.I.E.L.D. spy).
 * 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 pistahio 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.