Max Tennyson is Bens and Gwens grandfather. He takes them on summer vacation and is keeping a secret from them about the Omnitrix. Appearance[edit | edit source] Grandpa Max is an old man with grey hair. He has a tourism look with his hippi flower red shirt. Retrieved from "https://118011nick.fandom.com/wiki/Max_Tennyson?oldid=3960" Categories: Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.