Cassandra Halliwell/Season 1

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Vanquishing Ayacha
In Piper’s birthday celebration, the who family was reunited at the Halliwell manor when a Sender demon attacked and killed her mother Phoebe. Decided to save her mother, her sister Prue traveled back in time with Wyatt and Chris. When they returned, they brought the younger version of their mothers and prevented Phoebe’s death. Once Coop returned the mothers to their right time, the nine witches embarked on a trip to the Underworld to get rid of Ayacha. Together they did their first vanquishing as Destined Ones. Cassandra had her first encounter with a demon.

Meeting Leah
Cassandra, her sister Charlotte, and her cousins Wyatt, Chris,  Junior, Pandora were kidnapped and taken prisoners inside a cage protected against magic by Leah. The six of them tried their best to get out of the cage. They cast a spell to Call for a Lost Witch and ended up bringing Prue, Melinda and Tamora into the cage. Once there, the three of them revealed that they are the new Charmed Ones. Before getting free of the cage, they all learned that Leah is no other than the daughter of the late Seer and the late Source.

Demon stealing her identity
In Both Side of the Amulet, a demon pretended to be Cassandra to get hands on the Twin Dragon Amulet. No one noticed it and let Cassandra go with Jackson and Wyatt to get the Amulet from Shui. Cassandra showed up and Prue and the others realized they were fooled. Cassandra, who wanted to keep herself away from magical problems, decided to help the others to vanquish the demons just because some demon pretended to be her. They vanquished the demons and saved Jackson and Shui as well as got back the amulet.

Prue becoming her Cupid guide and first mistake using Cupid’s ring.
In Love And Other Cupid´s Disasters, Cassandra tried to make her friend Roxie happy by matching her with the demon Greg. Only that Cassandra didn´t know he was a demon. Once she found out, she asked Wyatt for help on telling Prue. Prue got mad at her as expected and was very rude on the baby Halliwell. They managed to find out the demon. Prue vanquished him and they took Roxie back home. But Greg´s father, Odell pretending to be his son, looked for revenge. Prue got even madder at her baby sister and asked her to step out of the way. Cassandra ran to her bedroom. Charlotte followed her and both talked. Cassandra confessed to Charlotte that she always wanted to be like her big sister because she was always Piper´s favorite niece, always being compared to Aunt Prue... Always responsible and master of her own life. Charlotte told her that Cassandra was special too. Prue listened to the conversation and then they talked and made amends. Later, Cassandra vanquished Odell when he attacked them at home.

Finding Doom’s cave
When Leah sent a demon to released Doom from his captivity, Cassandra unexpectedly found out where Doom’s whereabouts were. he was studying at the Berkeley library when she saw someone heading to a dark corridor and opening a door in a wall.

Return of Prudence Halliwell and finding out about Wyatt and Prue’s relationship
In The History of Prudence Halliwell, the Halliwells got to know that the late Prudence Halliwell was not only alive but was turned into a Whitelighter and was being chased by Darklighters sent by Leah. When Prue suggested that they should use the switching powers spell so Prudence could fight against the darklighters, Cassandra was in favor. Prudence ended up becoming evil and took Paige and Melinda with her. Gladly, all ended well and they got Prudence, Paige and Melinda back to normal. On the next day, before leaving, Prudence told Wyatt and Prue that they shouldn´t be hiding what´s going on between them. Prudence leaves and Wyatt and Prue told their family about their relationship. Cassandra like the rest of the family was shocked at the revelation, but she ended up accepting their relationship.

Helping a Ghost
Cassandra and her cousins Tamora and Pandora learned from Henry that a college boy who had suffered from a heart attack. Soon, the college boy appeared as a Ghost before them and revealed to them that didn’t die from a heart attack, but because someone killed him. It was actually Tammy, Amanda and Nora responsible for it. Amanda, later, revealed to them what actually happened to Jared and that it was Tammy who did kill Jared by using magic she got from a demon. They tried to stop Tammy from killing again and when Tammy turned against them willing to hurt them, Pandora and Tamora used their powers and vanquished Tammy.

Witch Hunter
A Witch Hunter arrived in town and kidnapped the Destined Ones’ girls. He had planned to kill them because they were witches. He didn’t know that the males in the family were also witches. He planned to burn them at stake. The boys tried their best to find them. While the girls tried to use their powers and cast spells to get rid of it, Wyatt discovered he had some kind of connection with Prue, similar to Phoebe and Coop’s connection. He was able to find her and therefore, finds them all. The boys went to rescue them and cast a spell on the hunter, who ended up crazy. At P3 Valentine's party, they all reunite to celebrate.

Wyatt turning Evil and battle against Leah
Unknown to them, Leah had become the Source of All Evil already and was more than willing to get rid of the Destined Ones once and for all. She found a way to do it, by turning Wyatt evil. She wasn’t counting, tough, with Prue having a vision where she saw Wyatt dying. Prue, Melinda, and Tamora decided to use the Cupid ring to travel in time and find out what will happen. But the girls traveled to a future where Wyatt was already dead. There, the girls found out that he became evil and was responsible for killing almost all the members of the family. The reason why he did it was because Prue didn't want to join him. They also found out that the one who turned Wyatt evil was Leah and that it was Prue herself who killed Wyatt. Prue, Melinda, and Tamora hunt Leah, and they vanquished her in the future. Then, they got back to their present just in time to see Wyatt becoming evil. There, Wyatt asked Prue to join him. All the family tried to stop Prue from going with Wyatt, but she was decided to go with him. Wyatt took her to the condo. Once there, Prue stabbed herself and almost died. She knew that only feeling that he could lose her would make Wyatt turn back to good. And that happened indeed. Then, the nine Destined Ones headed to the Underworld and try to vanquish Leah. But the Source was teleported out of there for some kind of unknown being.}}