An Officer and a Gentlelamb (S02E10)

Sheep struggles to maintain a steady job as he's constantly on the run from the Top Secret Military Organization. At their secret base, Gen. Specific dismisses his entire team, save for Private Public and the Angry Scientist, and sets out to recruit new personnel. Desperate for work, Sheep applies, and unbeknownst to Gen. Specific, he actually hires Sheep. However, the Angry Scientist soon uncovers Sheep’s true identity and informs Gen. Specific. In response, Gen. Specific instructs Sheep to capture him to prove he isn't the real Sheep. Cleverly, Sheep shows up with a Gorilla dressed in a sheep costume.