DC's Legends of Tomorrow
Season 2, Episode 17. "Aruba"
The 2017 team has no choice but to go back to 1916 and stop the Legion from getting the Spear of Destiny... even though if they meet their past selves it could a temporal calamity.
Season 2, Episode 13. "Ronin"
In the Season 2 finale, a revelation about the fate of the colony forces the Bowman family to make an impossible choice.
Season 4, Episode 6. "Bag of Cobras"
When it's discovered that The Hollow has employed a mysterious servant to do its bidding, Klaus and Elijah host an elaborate party in order to lure the new threat out and uncover its identity. Feeling a sense of responsibility for The Hollow's resurgence, Vincent uses his magic to help the Mikaelsons root out this latest threat. Meanwhile, after uncovering information about who may have been behind her parents' death, Hayley turns to Freya to help unlock her memories from that fateful day. Marcel also appears.
The Big Bang Theory
Season 10, Episode 22. "The Cognition Regeneration"
Leonard isn't thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack.
Season 2, Episode 13. "Caliban's War"
The Roci crew must fight to save the ship.