Although they were the primary threat in the Season 3 finale, this episode establishes them as the ultimate "ticking clock" the heroes must outrun in the past. Production and Reception Original Airdate: October 25, 2015.
A robotic scientist who saves the team and provides the technology for time travel and interstellar flight. [S4E1] Beyond the Known Universe
The episode marks the debut of the Insectoids , as well as several minor characters like Valaxina and Chupo. Although they were the primary threat in the