Twitch is a supporting antagonist in Toy Story 3. He is a male warrior insect and one of Lots-o'-Huggin' Bear's henchmen. He talks by using his mandibles and bears a resemblance to a moth.
Twitch is seen with the other toys from Sunnyside Daycare in the Butterfly Room when the toys have their first donation. Mrs. Potato Head meets him and feels his biceps after helping her when she had fallen, much to Mr. Potato Head's jealousy. Later that night, Twitch and the other of Lotso's workers enter a vending machine in Sunnyside Daycare playing poker using a See & Say toy.
Later on, he and the other toys find Buzz Lightyear out of the Caterpillar Room and seen capturing other toys under the Monkey's command. During confrontation with Lotso, Twitch and the other toys broke Chatter Telephone. Twitch and the rest of Lotso's workers retreated when Big Baby threw him into the dumpster.
When Sunnyside is restored, Twitch is waiting to be played at in the shelf by a toddler. He handles Chunk who is tossed by one of the toddlers.
Note: This description is taken from the original Toy Story 3 website. Do not modify it.
"Meet Twitch the insectaloid warrior, where MAN + INSECT = AWESOME! This sturdy action figure stands over five inches tall, with more than 15 points of articulation, including ferocious chomping mandibles. Use his powerful wings and impenetrable exoskeleton to evade capture! Twitch is meticulously detailed and includes his signature magical battle staff and removable chest armor. For children ages 4 and up. Other insectaloid figures sold separately."