Plexi is the baby niece of Plex. She is in Episode 5: Baby. She also in The Yo Gabba Gabba! Movies 5. She also appears in "Day Camp." She is voiced by Penelope Jacobs. But she is 1 year old. But sometime, but she is 2 from the episode "Baby". She was born in August 20, 2006 and is the daughter of Plex's sister.