“Left Behind”
Season 4, Episode 3
Air Date

March 25, 2015

Prod. code






Episode Guide

Bionic Rebellion


Mission Mania

"Left Behind" is the third episode of Season 4 of Lab Rats: Bionic Island. It aired on March 25, 2015. This is the seventy-fifth episode overall.

Fanmade episode by Andre132.

Plot Edit

When Leo leaves Spin on an island, Adam, Bree, Chase and Leo face an enemy they never thought they would see again. Meanwhile, Perry tries to impress Donald on a mission.

Story Edit

Leo and Spin go on a mission with Adam, Bree and Chase but Spin starts to annoy Leo so he leaves Spin on the island. But when Leo comes back to save Spin, he gets caught by a mysterious enemy. Now Adam, Bree, Chase, Donald, Perry and the soldiers have to save him.

Cast Edit

Main Cast Edit

  • Billy Unger as Chase Davenport
  • Spencer Boldman as Adam Davenport
  • Kelli Berglund as Bree Davenport
  • Tyrel Jackson Williams as Leo Dooley
  • Hal Sparks as Donald Davenport

Recurring Cast Edit

  • Maile Flanagan as Terry Perry
  • Cole Ewing as Sebastian Krane
  • Brandon Salgado-Telis as Bob Krane
  • Max Charles as Spin Krane
  • Graham Shiels as Victor Krane
  • Ashley Argota as S-1/Sarah Krane

Mentioned Cast Edit

  • Jeremy Kent Jackson as Douglas Davenport

Trivia Edit

  • S-1 is found on the island and gets renamed to Sarah.
  • Leo and Spin become mentors.
  • Krane puts Leo under the Triton App which means every main character has gone under the Triton App.

Userbox Edit

Code: LeftBehind

Picture1 This user's favourite episode is Left Behind!
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