Please answer the following question: Formulate an answer to this elaborate question: In addition to his mainstream incarnation, what character made his first appearances in "Uncanny X-Men Annual" #14 and "Uncanny X-Men" #266?
Answer:
Gambit makes his first appearances in "Uncanny X-Men Annual" #14 (July 1990) and "Uncanny X-Men" #266 (August 1990).