Issac Merlin is Caroline's love interest appearing in the Carrie's Greatest Missions (2003) episode: Caroline Gets Exposed. He has dark orange hair and green eyes. His main outfit is composed of: a blue long sleeved shirt, blue shorts, white socks and red shoes. He is voiced by Thomas Middleditch (who is also the voice of Penn Zero). At his age, he is 14 years old.
- Joanne Merlin (Mother)
- Montgomery Merlin (Father)
- Caroline Langston (Love Interest)