Chase and Kaz are confused about rejoining the EAF, and Daniel and Leo don't know if they should stay. Luckily, Bree, Oliver, Angus, Olive, Fletcher, and Chyna convince them what the right thing to do is. Kaz returns, his new bionic upgrade really working out, Leo stays, Daniel goes to help at the Academy, and Chase moves on to spend more time with his girlfriend. Also an oil spill mission comes up, then afterwords Oliver gets called to England to help his mother and the nation. While in England a complication happens which means the team-minus Skylar- must put aside their troubles especially with Evelyn Maya and help save their friend's family from an old enemy.
- Jake Short as Fletcher Quimby/ Oliver Quimby
- China Anne McClain as Chyna Parks
- Tyrel Jackson Williams as Leo Dooley
- Sierra McCormick as Olive Doyle
- Kelli Berglund as Bree Davenport
- Aedin Mincks as Angus Chestnut
- Jeremy Kent Jackson as Douglas Davenport
- Bradley Steven Perry as Kaz Duncan
- Sabrina Carpenter as Evelyn Davenport
- William Brent as Chase Davenport
- Spencer Boldman as Adam Davenport
- Pearce Joza as Daniel Davenport
- Ariel Winter as Tina Figgenbottom
- Jamie Denbo as Bridget Bernstein
- Nora Dunne as Janet Smythe
- Bradley Steven Perry is added back to the main cast.
- There is no special guest star.
- Sabrina Carpenter is added to the main cast, her first time in a weekly Disney Series since GMW ended, replacing Paris Berelc, who is relegated to a recurring cast member.
- Douglas is preparing a new bionic chip for himself.
- Adam is finally free as himself again, despite his memories of being the EF.