Sandra Tennyson

Sandra Tennyson is Carl Tennyson's wife and Ben Tennyson's mother. She is first introduced in the first live-action movie, Ben 10: Race Against Time. She wants Ben to call her "Sandra" not "mother," "mommy," or "mom". She is also seen in the episode Goodbye and Good Riddance.

Alien Force
Sandra made a cameo in the first episode, when she was washing the dishes, and yelling at Ben for running in the house. At that time, she was a brunette and not a blonde, but that may only be because she had it dyed, or in a brown hair net, or maybe it appeared brown because of the lighting in the kitchen. She reappears in the episode Grounded, where she and her husband witnessed Ben and Gwen fighting a Highbreed officer. She and Carl became angry at Ben for lying to them and forbid Ben from using the Omnitrix. However Ben decides to disobey them when Kevin is in trouble. Sandra and Carl spot Ben trying to sneak out of the house and then he is grounded. Ben later leaves to help Kevin, and Sandra and Carl realize Ben is only trying to protect the Earth, and they realize they were wrong to stop him, they then decide to go help Ben save his friend. Carl and Sandra help save Ben and Kevin from the Highbreed using Max's old blaster-rifle.

Ultimate Alien
She and Carl reappeared in the Ultimate Alien episode, Hit 'Em Where They Live, where she along with Ben's family are attacked by Ben's enemies. When she was washing the dishes, she was being ambushed by Sevenseven without realising it, but was saved by her father-in-law, Max Tennyson. Later in the episode, she was kidnapped by Zombozo and taken to an abandonded carnival. She was rescued by Gwen.

Original series

 * Ben 10: Race Against Time
 * Goodbye and Good Riddance

Alien Force

 * Ben 10 Returns: Part 1
 * Grounded

Ultimate Alien

 * Hit 'Em Where They Live

Trivia

 * Carl Tennyson always seems to contradict Sandra. Example-Sandra: Don't eat too much cheese Ben. Carl: Eat all the cheese you want Ben.
 * Sandra is the grandmother Kenny Tennyson (Ben's possible future son).
 * Sandra's name is pronounced differently in the movie than the series.