Dressing as the Enemy

Sometimes the heroes will disguise themselves as the villains or their henchmen in order to infiltrate the villain's lair and rescue a damsel in distress or a male damsel. This can also discover secrets from the enemy.

Disguise is an important role in dealing enemies as mere strength is not enough, as sometimes, the heroes would need to defeat them from the inside.

During a mission, their cover or the disguise gets blown after the villains discover that the hero/heroine is an imposter.

Examples

 * Dr. Cockroach, Missing Link, and B.O.B. disguise themselves as Gallaxhar clones to save Susan/Ginormica from Gallaxhar.
 * Ron Weasley and Harry Potter use Polyjuice Potion to transform into Crabbe and Goyle respectively, so they can sneak into the Slytherin Common Room and interrogate Draco Malfoy for information on the Chamber of Secrets.
 * Hermione Granger uses Polyjuice Potion to transform into Bellatrix Lestrange and break into her vault at Gringotts so they can find one of Lord Voldemort's horcruxes.
 * Moira MacTaggert disguises herself as a female stripper to sneak into a strip club and find out what Hellfire Club is up to.
 * Phoebe Halliwell disguises herself as a Demonatrix to infiltrate Vincent's lair and rescue their sister Paige Matthews.
 * Captain America impersonates Ultron's doppelgänger of a Captain America (Synthezoid) in order to save the Avengers who have been kidnapped.
 * Amethyst shapeshifts into a fully-developed Quartz soldier approximating Jasper in deign to confuse Homeworld Gems when traveling from Earth to far-out places like the Moon or the Human Zoo.
 * Jimmy Neutron impersonates himself as the Evil Jimmy Neutron to infiltrate the evil Earth and stop his evil counterpart.
 * The Scarecrow, Tin Man and Cowardly Lion disguise themselves as Winkie Guards to infiltrate The Wicked Witch's Castle and rescue Dorothy Gale.
 * Han Solo and Luke Skywalker disguise themselves as Storm Troopers to rescue Leia Organa from Darth Vader's clutches.
 * Baloo disguises himself as a female orangutan to fool King Louie and the Bandar-Log long enough so he and Bagheera can rescue Mowgli.
 * Mater shapeshifts into Ivan the tow truck to infiltrate the lemon meeting and find out who's been sabotaging the races of the World Grand Prix.
 * Samey uses a fake beauty mark to impersonate her evil sister Amy, while she's eliminated.
 * April O'Neil dresses up as a schoolgirl to obtain information from Dr. Baxter Stockman, suspecting him to be working for Shredder.
 * Justin Miller disguises himself as a criminal named Pupa to find out what's in the crates at Mossi Kasic's party.
 * Homer Simpson dresses up as General Marriott Suites to enter the dome and rescue all the citizens who were stuck in Springfield.
 * Karai disguises herself as Utrom Shredder to end the war in New York City between The Purple Dragons, The Mafia and The Foot Clan.
 * Cade Yeager dresses up as a KSI Scientist to investigate what's happened to the other Autobots who were hunted down and killed.
 * Emmet Brickowski and Wyldstyle disguise themselves as robots to infiltrate Octan Corporation, disarm the Kragle and stop Lord Business.
 * Shrek disguises himself as a worker to infiltrate the Fairy Godmother's potion factory and steal a powerful potion.
 * Captain Lone Starr and Barf steal two Spaceballs troopers' uniforms and disguise themselves as troopers in order to rescue Princess Vespa and Dot Matrix.
 * Natasha Romanoff masquerades herself as Councilwoman Hawley in order to gain access to the Triskelion and stop Hydra.
 * Jinx disguises herself as a Cobra red ninja to get close to Cobra Commander, Firefly and Zartan along with Storm Shadow, who was going after Zartan because he murdered the Hard Master.
 * Ethan Hunt poses himself as a criminal to find clues.
 * BB uses Lady Lux's body as a bike rider disguise to make a deal with CC and Dee Dee from her old band BCD in order to expose Lady Lux's plan.
 * Felonious Gru paints two of his own yellow Minions in purple paint, making them look like El Macho's mutated minions so they can infiltrate his lair and rescue Lucy Wilde.
 * Princess Jasmine disguises herself as one of the Palace guards to rescue Aladdin from Mozenrath.
 * Mystique shapeshifts into other humans or mutants in order to spy on them for various reasons or to rescue innocent lives.
 * Ashley Hammond disguises herself as Astronema in order to trick Elgar and warn Andros about the swap. In Power Rangers Lost Galaxy, after Karone was free from being brainwashed, she disguises as her alter-ego Astronema so she can steal the Pink Quasar Saber at an auction and give it back to the Rangers.
 * Batman disguises himself as Killer Croc to infiltrate the villain's meeting at the bar.
 * Little John disguises himself as the Sheriff of Nottingham in order to free Friar Tuck and the other prisoners.
 * Robin Hood disguises himself as Nutsy in order to fool The Sheriff of Nottingham and Trigger so he and Little John can rescue Friar Tuck and the other prisoners.
 * Ace Ventura disguises himself as a Wachootoo dancer to infiltrate their village and search for Shikaka.
 * The Autobots disguise themselves as the Stunticons to penetrate the Decepticon camp.
 * Ulysses, Pete and Delmar disguise themselves as KKK members to rescue Tommy from being hanged.
 * Ratchet uses the Tyhrra-Guise to get into Dr. Nefarious' office on planet Aqauatos.
 * Jack disguising himself as a demonic minion to sneak into Aku's domain and rescue Prince Astor and Princess Verbina.
 * Shaggy and Scooby disguise themselves as Kriegstaffebots in order to rescue the townsfolk from Professor Pericles.
 * The Undertaker masquerades himself as his brother Kane to infiltrate the wrestling match against Mankind and become the number #1 contender for the WWE title from Stone Cold Steve Austin.
 * Sokka and Prince Zuko disguise themselves as prison guards to infiltrate the Boiling Rock and rescue Suki and Sokka's father.