Marvel's Avengers (2013)

S2E25 New Frontiers

Title: Uncharted Territories Plot: The Avengers receive a desperate plea for help from an alien civilization under threat from enigmatic assailants. As they investigate, the team uncovers that Thanos, recently escaped from captivity, along with his Black Order, is ravaging the planet. Simultaneously, Tony Stark searches for fresh opportunities to push the team’s limits.