Max is a semi-retired legendary Plumber, is the mentor of Ben, Gwen and Kevin and the Plumber Helpers. According to Azmuth, Max is widely considered the greatest plumber in the Milky Way Galaxy. Max is currently Magister of Earth.
In Story Of Costin, he was called by Ben to hear Costin's Story.
In Energy Off, he gave Ben a pet.
In Goodbye Gwen And Kevin, he told Ben that some enemies are going to attack Gwen, Kevin and Chris for revenge.
In The Start Of Evil War, he cheered up Ben by telling him that he will catch Psyphon soon.
Goodbye Gwen And Kevin(Only voice)
|Ben 10 Characters|
|Ben Tennyson | Tack|
|Gwen Tennyson | Kevin Levin | Max Tennyson | Chris | Julie Yamamoto | Manny Armstrong | Helen Wheels | Alan Abright | Jimmy Jones | Azmuth | Paradox | Cooper Daniels | Ship | Eunice | Sir George| Costin|
|Tetrax Shard | Colonel Rozum | Sugilite | Albedo|
|Hope | Argit | Hex | Simian | Baz-EL|