The Blue's Clues Movie

The Blue's Clues Movie (also known as: Blue's Clues: Mailbox's Retirement Day) is the movie where Mailbox retires. Steve and Blue figure out who will replace him.

Clues

 * 1) Mouse
 * 2) Screen
 * 3) 8-bit Sounds

Answer
Computer

Trivia
This episode doesn't have Mailtime.