Catherine meets court scientist Nikolai, who announces a comet is about to pass through Russia. She uses this phenomenon to her advantage and in the face of some huge challenges, unearths a new side of her leadership.
Under orders from Catherine, Grigor hides out in the forest with Paul. Catherine plays a dangerous game with herself to prove that her destiny lies in Russia, and grapples with the impact Peter’s decisions have on her rule.
Arkady and Tatyana help Peter and Catherine through a rough patch as they clash over their son Paul. Catherine fears Paul will grow up to be a ruthless and careless leader and Archie and Elizabeth are alarmed when Catherine refuses to ordain him.
Catherine wants to bring more fun to the court. With Georgina’s help she stages a festival of truth, jokes and stunningly clever ideas. Katya puts on a play that challenges Catherine’s reign, and Catherine samples Peter’s invention of salty desserts.
Catherine tries to persuade Peter to come home whilst Hugo re-doubles his attempts to regain his kingdom. Georgina continues to play her complicated court games.
Catherine involves the peasants, nobles and merchants in a conference designed to bring change to Russia. Peter’s hunt for revenge on an historic enemy threatens to destabilise Catherine’s attempt to outlaw murder.
Peter is once again tormented by his father, Peter the Great’s expectations and his failure to continue the legacy of his empire. Catherine must decide what to do about the unrest being stirred up in the regions, but Velementov is in no state to help her.
It's the California Gold Rush and Sean must act quickly to rescue his father from an evil gang with the help of fellow outlaws Ashley Rose and Tia Trish.
Issei and Camille puzzle over the second test, which involves a 17th-century painting and mysterious one-word clue.
In Borneo, apes and monkeys train their babies in the treetops, but with gravity against them, the stakes are high—and crocodiles lurk below.
A blazing sun scorches the African savanna, where the planet's biggest bird protects his eggs and giraffes struggle to fuel their towering bodies.
The grisly discovery in the trunk provides a new line of inquiry that leads to a hidden room, ties to intelligence agents, and a scandalous society at the heart of the museum. The team race to crack the case as the killer prepares to strike again.
After an emotional deliberation and a visit from guest judge Indina Menzel, the Queens realize that sending their competitors home is harder than expected.
In their second deliberation of the season, the All Stars discuss whether personal relationships or track record matter most when determining who goes home. And, the Fame Games kick off, featuring the runway looks of eliminated queens.
The world’s largest Super Soaker, the world’s largest Nerf blaster, and a snowball machine gun are among Mark’s most ridiculously scaled-up creations.
As Marsiversary celebrations begin, Trevor tracks Hubert and Crystal searches for a missing Jeff -- following a trail that leads to Tee's crew.
The Buckies scramble to avoid being caught while Jeff slips further to the dark side of Mar.sly corporate.